DISCOVER CARD MASTER TRUST I
8-K, 1998-05-13
ASSET-BACKED SECURITIES
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<PAGE>   1
                                                                 CONFORMED COPY

                       SECURITIES AND EXCHANGE COMMISSION
                             450 Fifth Street, N.W.
                             Washington, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT


                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934


         Date of Report (Date of earliest event reported): May 15, 1998



                          DISCOVER CARD MASTER TRUST I
                          ----------------------------
             (Exact name of registrant as specified in its charter)


Delaware                         0-23108                    Not Applicable
- --------                         -------                    --------------
(State of                        (Commission                (IRS Employer
organization)                    File Number)               Identification No.)


c/o Greenwood Trust Company
12 Read's Way
New Castle, Delaware                                             19720
- -------------------------------------------------------------------------
(Address of principal executive offices)                       (Zip Code)


Registrant's telephone number, including area code: (302) 323-7184


                                 Not Applicable
                 ----------------------------------------------
                 (Former address, if changed since last report)


                                  Page 1 of 134
                         Index to Exhibits is on page 7


<PAGE>   2

Item 5.  Other Events

A)      Series 1993-1:
On May 15, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the April 1998 Due Period with respect to Series 1993-1, which is
attached as Exhibit 20(a) hereto.

B)      Series 1993-2:
On May 15, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the April 1998 Due Period with respect to Series 1993-2, which is
attached as Exhibit 20(b) hereto.

C)      Series 1993-3:
On May 15, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the April 1998 Due Period with respect to Series 1993-3, which is
attached as Exhibit 20(c) hereto.

D)      Series 1994-2:
On May 15, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the April 1998 Due Period with respect to Series 1994-2, which is
attached as Exhibit 20(d) hereto.

E)      Series 1994-3:
On May 15, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the April 1998 Due Period with respect to Series 1994-3, which is
attached as Exhibit 20(e) hereto.

F)      Series 1994-A:
On May 15, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the April 1998 Due Period with respect to Series 1994-A, which is
attached as Exhibit 20(f) hereto.

G)      Series 1995-1:
On May 15, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the April 1998 Due Period with respect to Series 1995-1, which is
attached as Exhibit 20(g) hereto.

H)      Series 1995-2:
On May 15, 1998 the Registrant made available the Monthly Certificateholders
Statement for the April 1998 Due Period with respect to Series 1995-2, which is
attached as Exhibit 20(h) hereto.

I)      Series 1995-3:
On May 15, 1998 the Registrant made available the Monthly Certificateholders
Statement for the April 1998 Due Period with respect to Series 1995-3, which is
attached as Exhibit 20(i) hereto.

J)      Series 1996-1:
On May 15, 1998 the Registrant made available the Monthly Certificateholders
Statement for the April 1998 Due Period with respect to Series 1996-1, which is
attached as Exhibit 20(j) hereto.

K)      Series 1996-2:
On May 15, 1998 the Registrant made available the Monthly Certificateholders
Statement for the April 1998 Due Period with respect to Series 1996-2, which is
attached as Exhibit 20(k) hereto.


<PAGE>   3
L)      Series 1996-3:
On May 15, 1998 the Registrant made available the Monthly Certificateholders
Statement for the April 1998 Due Period with respect to Series 1996-3, which is
attached as Exhibit 20(l) hereto.

M)      Series 1996-4:
On May 15, 1998 the Registrant made available the Monthly Certificateholders
Statement for the April 1998 Due Period with respect to Series 1996-4, which is
attached as Exhibit 20(m) hereto.

N)      Series 1997-1:
On May 15, 1998 the Registrant made available the Monthly Certificateholders
Statement for the April 1998 Due Period with respect to Series 1997-1, which is
attached as Exhibit 20(n) hereto.

O)      Series 1997-2:
On May 15, 1998 the Registrant made available the Monthly Certificateholders
Statement for the April 1998 Due Period with respect to Series 1997-2, which is
attached as Exhibit 20(o) hereto.

P)      Series 1997-3:
On May 15, 1998 the Registrant made available the Monthly Certificateholders
Statement for the April 1998 Due Period with respect to Series 1997-3, which is
attached as Exhibit 20(p) hereto.

Q)      Series 1997-4:
On May 15, 1998 the Registrant made available the Monthly Certificateholders
Statement for the April 1998 Due Period with respect to Series 1997-4, which is
attached as Exhibit 20(q) hereto.

R)      Series 1998-1:
On May 15, 1998 the Registrant made available the Monthly Certificateholders
Statement for the April 1998 Due Period with respect to Series 1998-1, which is
attached as Exhibit 20(r) hereto.

S)      Series 1998-2:
On May 15, 1998 the Registrant made available the Monthly Certificateholders
Statement for the April 1998 Due Period with respect to Series 1998-2, which is
attached as Exhibit 20(s) hereto.

T)      Series 1998-3:
On May 15, 1998 the Registrant made available the Monthly Certificateholders
Statement for the April 1998 Due Period with respect to Series 1998-3, which is
attached as Exhibit 20(t) hereto.

U)      Series 1998-4:
On May 15, 1998 the Registrant made available the Monthly Certificateholders
Statement for the April 1998 Due Period with respect to Series 1998-4, which is
attached as Exhibit 20(u) hereto.


<PAGE>   4
Item 7.  Financial Statements and Exhibits
c) Exhibits

Exhibit No.        Description
- -----------        -----------

20(a)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1993-1.

20(b)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1993-2.

20(c)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1993-3.

20(d)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1994-2.

20(e)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1994-3.

20(f)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1994-A.

20(g)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1995-1.

20(h)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1995-2.

20(i)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1995-3.

20(j)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1996-1.

20(k)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1996-2.

20(l)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1996-3.

20(m)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1996-4.

20(n)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1997-1.


<PAGE>   5
20(o)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1997-2.

20(p)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1997-3.

20(q)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1997-4.

20(r)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1998-1.

20(s)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1998-2.

20(t)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1998-3.

20(u)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1998-4.


<PAGE>   6
                                   SIGNATURES

     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.

                                          DISCOVER CARD MASTER TRUST I
                                                  (Registrant)

                                          By: GREENWOOD TRUST COMPANY
                                              as originator of the Trust


                                          By:         John J. Coane
                                             ----------------------------------
                                             John J. Coane
                                             Vice President, Director of
                                             Accounting and Treasurer


Date: May 15, 1998


<PAGE>   7
                                  EXHIBIT INDEX

Exhibit No.        Description
- -----------        -----------

20(a)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1993-1.

20(b)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1993-2.

20(c)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1993-3.

20(d)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1994-2.

20(e)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1994-3.

20(f)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1994-A.

20(g)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1995-1.

20(h)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1995-2.

20(i)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1995-3.

20(j)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1996-1.

20(k)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1996-2.

20(l)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1996-3.

20(m)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1996-4.

20(n)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1997-1.

20(o)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1997-2.


<PAGE>   8
20(p)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1997-3.

20(q)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1997-4.

20(r)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1998-1.

20(s)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1998-2.

20(t)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1998-3.

20(u)              Monthly Certificateholders' Statement, related to the Due
                   Period ending April 30, 1998, for Series 1998-4.



<PAGE>   1
                                                                    EXHIBIT (A)

                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1993-1 Monthly Statement
                      Class A Certificate CUSIP #25466KAA7
                      Class B Certificate CUSIP #25466KAB5


Trust Distribution Date: May 15, 1998         Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of October 27, 1993 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
     Series  1993-1                                                                 Total              Interest         Principal
     <S>                <C>                                                 <C>                    <C>              <C>  
             Class A    30 days at 5.926250000%                             $88.271875000          $4.938541667     $83.333333333

             Class B    30 days at 5.300000000%                              $4.416666667          $4.416666667      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period


<TABLE>
<S>                                                                                                            <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1993-1 Investor Interest                                                                         $735,373,000.00

      (e) Class A Investor Interest                                                                               $687,500,000.00

          Class B Investor Interest                                                                                $47,873,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                          Finance Charge          Principal            Yield
                                                                           Collections           Collections        Collections
<S>                                                                      <C>                 <C>                   <C> 
      (a) Allocation of Collections between Investor and Sellero

          Aggregate Investor Allocation.                                  $275,244,468.65     $2,127,916,652.24             $0.00

          Seller:                                                          $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1993-1 Allocations                                        $12,580,341.47        $97,258,696.04             $0.00

      (e) Class A Allocations                                              $11,818,819.59        $91,371,365.77             $0.00

          Class B Allocations                                                 $761,521.88         $5,887,330.27             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                Deposits into the
                                                   SPFAs This                SPFA          Deposit Deficit    Investment
                                                   Due Period              Balance              Amount          Income
<S>                                             <C>                         <C>             <C>                <C>  
          Series 1993-1                         $62,500,000.00               $0.00               0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                Total Payments
                                                                 Amount Paid         Deficit Amount      Through This
                                                               This Due Period      This Due Period       Due Period
<S>                                                            <C>                  <C>                <C>           
          Series 1993-1                                         $62,500,000.00              $0.00       $62,500,000.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                  Deposits Into the
                                                                     SIFAs This
                                                                     Due Period                         SIFA Balance
<S>                                                                <C>                                     <C>  
          Series 1993-1                                             $3,915,345.33                          $0.00
</TABLE>


7.   Pool Factors

<TABLE>
<CAPTION>
                                                                                                    This Due Period
<S>                                                                                                    <C>       
          Class A                                                                                      0.91666667

          Class B                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                     Cumulative
                                                                                                Investor Charged-Off
                                                                          This Due Period              Amount
<S>                                                                       <C>                          <C>  
      (a) Group One                                                        $80,595,713.85              $0.00

      (b) Group Two                                                        $13,787,758.20              $0.00

      (c) Series 1993-1                                                     $4,313,897.07              $0.00

      (d) Class A                                                           $4,052,765.29              $0.00

          Class B                                                             $261,131.78              $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                  Per $1,000 of
                                                                                                Original Invested
                                                                                 Total              Principal
<S>                                                                              <C>                  <C>  
      (a) Group One                                                              $0.00                $0.00
                                                                                
      (b) Group Two                                                              $0.00                $0.00
                                                                                
      (c) Series 1993-1                                                          $0.00                $0.00
                                                                                 
      (d) Class A                                                                $0.00                $0.00
                                                                                
          Class B                                                                $0.00                $0.00
</TABLE>


<PAGE>   3
10.  Reimbursement of Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total       Principal
<S>                                                                                                       <C>     <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1993-1                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>


11.  Aggregate Amount of Unreimbursed Investor Losses
<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total        Principal
<S>                                                                                                       <C>     <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1993-1                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                                <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1993-1                                                                                             $1,329,788.33

      (d) Class A                                                                                                   $1,250,000.00

          Class B                                                                                                      $79,788.33
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                    As a Percentage
                                                                                                                       of Class A
                                                                                                      Total         Invested Amount
<S>                                                                                              <C>                <C>    
          Series 1993-1 Class B                                                                  $63,829,840.00            9.2843%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                  Shared Amount   Class B Amount
<S>                                                                                              <C>              <C>           
          Maximum Amount                                                                         $18,384,325.00    $15,957,460.00

          Available Amount                                                                       $18,384,325.00    $15,957,460.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                            $0.00             $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                 <C>               
     End of Due Period Master Trust Receivables Outstanding         $20,448,816,201.71
</TABLE>

<TABLE>
<CAPTION>
                                                                     Delinquent Amount       Percentage of Ending
     Payment Status                                                  Ending Balance        Receivables Outstanding
     <S>                                                             <C>                    <C>  
     30-59 days                                                      $578,496,902.86                2.83%

     60-179 days                                                     $890,849,726.42                4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: ____________________________
                                            Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1993-1 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the "Pooling & Servicing Agreement") and
the Series Supplement, dated as of October 27, 1993 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1993-1 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<S>                                                                                          <C> 
    1.   Greenwood is Master Servicer under the Pooling and Servicing Agreement.

    2.   The undersigned is a Servicing Officer of Greenwood as Master Servicer.

    3.   The aggregate amount of Collections processed during the related Due
         Period is equal to                                                                  $2,659,540,859.87

    4.   The aggregate amount of Class A Principal Collections processed during
         the related Due Period is equal to                                                     $91,371,365.77

    5.   The aggregate amount of Class A Finance Charge Collections processed
         during the related Due Period is equal to                                              $11,818,819.59

    6a.  The aggregate amount of Class A Principal Collections recharacterized
         as Series Yield Collections during the related Due Period is equal
         to                                                                                              $0.00

    6b.  The aggregate amount of Class A Additional Funds for this Distribution
         date is equal to                                                                                $0.00

    7.   The amount of drawings under the Credit Enhancement required to be
         made on the related Drawing Date pursuant to the Series Supplement:

         (a)  with respect to the Class A Required Amount Shortfall is equal to                          $0.00

         (b)  with respect to the Class A Cumulative Investor Charged-Off
              Amount is equal to                                                                         $0.00

         (c)  with respect to the Class A Investor Interest is equal to                                  $0.00

    8.   The sum of all amounts payable to the Class A Certificateholders on
         the current Distribution Date is equal to                                              $66,203,906.25
</TABLE>

<PAGE>   6
<TABLE>
<S>                                                                                              <C>  
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                      $5,887,330.27

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                 $761,521.88

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                            0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                      $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                  $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                 $211,439.08

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                        as Master Servicer


                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                    EXHIBIT (B)

                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1993-2 Monthly Statement
                      Class A Certificate CUSIP #25466KAE9
                      Class B Certificate CUSIP #25466KAF6


Trust Distribution Date: May 15, 1998        Due Period Ending:  April 30, 1998

Pursuant to the Series Supplement dated as of December 1, 1993 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
     Series  1993-2                                                      Total               Interest         Principal
<S>                                                                  <C>                   <C>               <C>         
     Class A      30 days at 5.400000000%                            $4.500000000          $4.500000000      $0.000000000

     Class B      30 days at 5.750000000%                            $4.791666667          $4.791666667      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                           <C> 
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00

          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1993-2 Investor Interest                                                                         $833,334,000.00

      (e) Class A Investor Interest                                                                               $800,000,000.00

          Class B Investor Interest                                                                                $33,334,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period


<TABLE>
<CAPTION>
                                                                          Finance Charge          Principal                Yield
                                                                            Collections         Collections             Collections
<S>                                                                      <C>                 <C>                        <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                                   $275,244,468.65     $2,127,916,652.24             $0.00

          Seller                                                           $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1993-2 Allocations                                        $13,128,637.23       $101,497,573.83             $0.00

      (e) Class A Allocations                                              $12,610,802.35        $97,494,189.25             $0.00

          Class B Allocations                                                 $517,834.88         $4,003,384.58             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                      Deposits into the
                                                          SPFAs This               SPFA              Deposit      Deficit Investment
                                                          Due Period              Balance             Amount            Income
<S>                                                   <C>                         <C>                <C>          <C>  
          Series 1993-2                                         $0.00               $0.00              0.00              $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                      Total Payments
                                                                                Amount Paid        Deficit Amount      Through This
                                                                              This Due Period      This Due Period      Due Period
<S>                                                                           <C>                  <C>                <C>  
          Series 1993-2                                                             $0.00               $0.00              $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                              Deposits Into the
                                                                                                 SIFAs This
                                                                                                 Due Period           SIFA Balance
<S>                                                                                           <C>                     <C>  
          Series 1993-2                                                                         $3,759,725.42            $0.00
</TABLE>

7.   Pool Factors

<TABLE>
<CAPTION>
                                                                                                                  This Due Period
<S>                                                                                                               <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                     Cumulative
                                                                                                                Investor Charged-Off
                                                                                                This Due Period        Amount
<S>                                                                                             <C>             <C>  
      (a) Group One                                                                              $80,595,713.85         $0.00

      (b) Group Two                                                                              $13,787,758.20         $0.00

      (c) Series 1993-2                                                                           $4,501,911.96         $0.00

      (d) Class A                                                                                 $4,324,342.35         $0.00

          Class B                                                                                   $177,569.61         $0.00
</TABLE>


9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                     Per $1,000 of
                                                                                                                   Original Invested
                                                                                                          Total         Principal
<S>                                                                                                      <C>       <C>  
      (a) Group One                                                                                       $0.00           $0.00

      (b) Group Two                                                                                       $0.00           $0.00

      (c) Series 1993-2                                                                                   $0.00           $0.00

      (d) Class A                                                                                         $0.00           $0.00

          Class B                                                                                         $0.00           $0.00
</TABLE>


<PAGE>   3
10.  Reimbursement of Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                     Per $1,000 of
                                                                                                                   Original Invested
                                                                                                          Total           Principal
<S>                                                                                                       <C>      <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1993-2                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

11.  Aggregate Amount of Unreimbursed Investor Losses

<TABLE>
<CAPTION>
                                                                                                                   Per $1,000 of
                                                                                                                  Original Invested
                                                                                                           Total      Principal
<S>                                                                                                       <C>     <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1993-2                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                                <C>  
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1993-2                                                                                             $1,388,890.00

      (d) Class A                                                                                                   $1,333,333.33

          Class B                                                                                                      $55,556.67
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                   As a Percentage
                                                                                                                      of Class A
                                                                                                      Total         Invested Amount
<S>                                                                                              <C>               <C>    
          Series 1993-2 Class B                                                                  $50,000,040.00            6.2500%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                  Shared Amount    Class B Amount
<S>                                                                                              <C>               <C>          
          Maximum Amount                                                                         $20,833,350.00    $8,333,340.00

          Available Amount                                                                       $20,833,350.00    $8,333,340.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                            $0.00            $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                           <C>               
         End of Due Period Master Trust Receivables Outstanding                                               $20,448,816,201.71
</TABLE>


<TABLE>
<CAPTION>
                                                                        Delinquent Amount          Percentage of Ending
          Payment Status                                                   Ending Balance        Receivables Outstanding
<S>                                                                     <C>                      <C>  
          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: ____________________________
                                                 Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1993-2 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the "Pooling & Servicing Agreement") and
the Series Supplement, dated as of December 1, 1993 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1993-2 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<S>                                                                                          <C>   
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                  $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                     $97,494,189.25

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                              $12,610,802.35

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                           $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                      $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                  $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                               $3,600,000.00
</TABLE>


<PAGE>   6


<TABLE>
<S>                                                                                              <C> 
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                      $4,003,384.58

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                 $517,834.88

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                           $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                      $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                  $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                 $159,725.42

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>


     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                        as Master Servicer

                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (C)


                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1993-3 Monthly Statement
                      Class A Certificate CUSIP #25466KAC3
                      Class B Certificate CUSIP #25466KAD1


Trust Distribution Date: May 15, 1998        Due Period Ending:  April 30, 1998

Pursuant to the Series Supplement dated as of November 23, 1993 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
     Series  1993-3                                                             Total               Interest          Principal
<S>                       <C>                                                <C>                   <C>               <C>  
             Class A      30 days at 6.200000000%                            $5.166666667          $5.166666667      $0.000000000

             Class B      30 days at 6.450000000%                            $5.375000000          $5.375000000      $0.000000000
</TABLE>


2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                            <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00

          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1993-3 Investor Interest                                                                         $366,493,000.00

      (e) Class A Investor Interest                                                                               $350,000,000.00

          Class B Investor Interest                                                                                $16,493,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period


<TABLE>
<CAPTION>
                                                                         Finance Charge         Principal                Yield
                                                                           Collections         Collections             Collections
<S>                                                                      <C>                  <C>                      <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                                   $275,244,468.65     $2,127,916,652.24             $0.00

          Seller                                                           $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1993-3 Allocations                                         $5,787,566.29        $44,743,710.04             $0.00

      (e) Class A Allocations                                               $5,513,418.42        $42,624,271.14             $0.00

          Class B Allocations                                                 $274,147.87         $2,119,438.90             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")


<TABLE>
<CAPTION>
                                                   Deposits into the
                                                      SPFAs This               SPFA           Deposit Deficit            Investment
                                                      Due Period              Balance             Amount                   Income
<S>                                                <C>                        <C>             <C>                        <C>  
          Series 1993-3                                   $0.00               $0.00                0.00                     $0.00
</TABLE>


5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                      Total Payments
                                                                    Amount Paid              Deficit Amount            Through This
                                                                  This Due Period            This Due Period            Due Period
<S>                                                               <C>                        <C>                     <C>  
          Series 1993-3                                                   $0.00                   $0.00                     $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                            Deposits Into the
                                                                                               SIFAs This
                                                                                               Due Period             SIFA Balance
<S>                                                                                          <C>                       <C>  
          Series 1993-3                                                                       $1,896,983.21                 $0.00
</TABLE>

7.   Pool Factors

<TABLE>
<CAPTION>
                                                                                                                    This Due Period
<S>                                                                                                                 <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                     Cumulative
                                                                                                                Investor Charged-Off
                                                                                            This Due Period            Amount
<S>                                                                                         <C>                 <C>  
      (a) Group One                                                                          $80,595,713.85              $0.00

      (b) Group Two                                                                          $13,787,758.20              $0.00

      (c) Series 1993-3                                                                       $1,984,601.56              $0.00

      (d) Class A                                                                             $1,890,594.12              $0.00

          Class B                                                                                $94,007.44              $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                Original               Invested
                                                                                                  Total                Principal
<S>                                                                                             <C>                 <C>  
      (a) Group One                                                                               $0.00                  $0.00

      (b) Group Two                                                                               $0.00                  $0.00

      (c) Series 1993-3                                                                           $0.00                  $0.00

      (d) Class A                                                                                 $0.00                  $0.00

          Class B                                                                                 $0.00                  $0.00
</TABLE>


<PAGE>   3

10.   Reimbursement of Investor Losses This Due Period

<TABLE>
<CAPTION>

                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                                   Total              Principal
<S>                                                                                                <C>           <C>  
      (a) Group One                                                                                $0.00                  $0.00

      (b) Group Two                                                                                $0.00                  $0.00

      (c) Series 1993-3                                                                            $0.00                  $0.00

      (d) Class A                                                                                  $0.00                  $0.00

          Class B                                                                                  $0.00                  $0.00
</TABLE>

11.  Aggregate Amount of Unreimbursed Investor Losses

<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                                   Total              Principal
<S>                                                                                                <C>            <C>  
      (a) Group One                                                                                $0.00                  $0.00

      (b) Group Two                                                                                $0.00                  $0.00

      (c) Series 1993-3                                                                            $0.00                  $0.00

      (d) Class A                                                                                  $0.00                  $0.00

          Class B                                                                                  $0.00                  $0.00
</TABLE>


12.  Investor Monthly Servicing Fee Payable at the end of the Due Period
<TABLE>
<S>                                                                                                               <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1993-3                                                                                               $610,821.66

      (d) Class A                                                                                                     $583,333.33

          Class B                                                                                                      $27,488.33
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                   As a Percentage
                                                                                                                       of Class A
                                                                                                   Total            Invested Amount
<S>                                                                                           <C>                  <C>    
          Series 1993-3 Class B                                                               $23,822,045.00               6.8063%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                               Shared Amount       Class B Amount
<S>                                                                                            <C>                 <C>          
          Maximum Amount                                                                       $9,162,325.00       $5,497,395.00

          Available Amount                                                                     $9,162,325.00       $5,497,395.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                         $0.00                $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                               <C>               
           End of Due Period Master Trust Receivables Outstanding                                 $20,448,816,201.71
</TABLE>


<TABLE>
<CAPTION>
                                                                        Delinquent Amount        Percentage of Ending
          Payment Status                                                  Ending Balance        Receivables Outstanding
<S>                                                                     <C>                     <C>  
          30-59 days                                                      $578,496,902.86                 2.83%

          60-179 days                                                     $890,849,726.42                 4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: ____________________________
                                                 Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1993-3 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the "Pooling & Servicing Agreement") and
the Series Supplement, dated as of November 23, 1993 (the "Series Supplement")
by and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1993-3 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<S>                                                                                         <C> 
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                  $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                     $42,624,271.14

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                               $5,513,418.42

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                           $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                      $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                  $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                              $10,849,999.98
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                              <C>  
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                      $2,119,438.90

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                 $274,147.87

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                           $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                      $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                  $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                 $531,899.28

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                        as Master Servicer

                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (D)


                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1994-2 Monthly Statement
                      Class A Certificate CUSIP #25466KAJ8
                      Class B Certificate CUSIP #25466KAK5


Trust Distribution Date: May 15, 1998         Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of October 14, 1994 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
     Series  1994-2                                                              Total               Interest          Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 6.006250000%                            $5.005208333          $5.005208333      $0.000000000

             Class B      30 days at 8.050000000%                            $6.708333333          $6.708333333      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                           <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00

          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1994-2 Investor Interest                                                                         $894,737,000.00

      (e) Class A Investor Interest                                                                               $850,000,000.00

          Class B Investor Interest                                                                                $44,737,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                          Finance Charge         Principal                Yield
                                                                            Collections         Collections            Collections
<S>                                                                       <C>                 <C>                      <C>  

      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                                   $275,244,468.65     $2,127,916,652.24             $0.00

          Seller                                                           $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1994-2 Allocations                                        $14,103,385.24       $109,033,356.58             $0.00

      (e) Class A Allocations                                              $13,402,785.11       $103,617,012.73             $0.00

          Class B Allocations                                                 $700,600.13         $5,416,343.85             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                         Deposits into the
                                                             SPFAs This              SPFA         Deposit Deficit        Investment
                                                             Due Period            Balance            Amount               Income
<S>                                                      <C>                       <C>             <C>                   <C>  
          Series 1994-2                                         $0.00               $0.00                0.00               $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                      Total Payments
                                                                             Amount Paid        Deficit Amount         Through This
                                                                           This Due Period      This Due Period         Due Period
<S>                                                                        <C>                  <C>                  <C>  
          Series 1994-2                                                           $0.00               $0.00                 $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                              Deposits Into the
                                                                                                 SIFAs This
                                                                                                 Due Period           SIFA Balance
<S>                                                                                           <C>                   <C>  
          Series 1994-2                                                                         $4,554,537.79              $0.00
</TABLE>

7.   Pool Factors

<TABLE>
<CAPTION>
                                                                                                                  This Due Period
<S>                                                                                                               <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                    Cumulative
                                                                                                                Investor Charged-Off
                                                                                           This Due Period            Amount
<S>                                                                                        <C>                  <C>  
      (a) Group One                                                                         $80,595,713.85              $0.00

      (b) Group Two                                                                         $13,787,758.20              $0.00

      (c) Series 1994-2                                                                      $4,836,160.64              $0.00

      (d) Class A                                                                            $4,595,919.40              $0.00

          Class B                                                                              $240,241.24              $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                                     Total            Principal
<S>                                                                                                  <C>       <C>
      (a) Group One                                                                                  $0.00              $0.00

      (b) Group Two                                                                                  $0.00              $0.00

      (c) Series 1994-2                                                                              $0.00              $0.00

      (d) Class A                                                                                    $0.00              $0.00

          Class B                                                                                    $0.00              $0.00
</TABLE>


<PAGE>   3
10.  Reimbursement of Investor Losses This Due Period 
<TABLE>
<CAPTION>
                                                                                                                     Per $1,000 of
                                                                                                                  Original Invested
                                                                                                        Total          Principal
<S>                                                                                                     <C>              <C>  
      (a) Group One                                                                                     $0.00             $0.00

      (b) Group Two                                                                                     $0.00             $0.00

      (c) Series 1994-2                                                                                 $0.00             $0.00

      (d) Class A                                                                                       $0.00             $0.00

          Class B                                                                                       $0.00             $0.00
</TABLE>

11.  Aggregate Amount of Unreimbursed Investor Losses
<TABLE>
<CAPTION>
                                                                                                                       Per $1,000 of
                                                                                                        Original          Invested
                                                                                                          Total           Principal
<S>                                                                                                     <C>             <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1994-2                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                               <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1994-2                                                                                             $1,491,228.34

      (d) Class A                                                                                                   $1,416,666.67

          Class B                                                                                                      $74,561.67
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                   As a Percentage
                                                                                                                     of Class A
                                                                                                   Total           Invested Amount
<S>                                                                                            <C>                    <C>     
          Series 1994-2 Class B                                                                $89,473,700.00         10.5263%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                             Shared Amount          Class B Amount
<S>                                                                                          <C>                    <C>         
          Maximum Amount                                                                         $0.00              $44,736,850.00

          Available Amount                                                                       $0.00              $44,736,850.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                   $0.00                       $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
          End of Due Period Master Trust Receivables Outstanding                                               $20,448,816,201.71
</TABLE>


<TABLE>
<CAPTION>
                                                                        Delinquent Amount        Percentage of Ending
          Payment Status                                                  Ending Balance        Receivables Outstanding
<S>                                                                     <C>                     <C>  
          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                            Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1994-2 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the "Pooling & Servicing Agreement") and
the Series Supplement, dated as of October 14, 1994 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1994-2 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<S>                                                                                          <C>   
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                  $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                    $103,617,012.73

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                              $13,402,785.11

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                           $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                      $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                  $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                               $4,254,427.08
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                              <C>
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                      $5,416,343.85

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                 $700,600.13

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                           $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                      $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                  $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                 $300,110.71

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                      GREENWOOD TRUST COMPANY
                                      as Master Servicer

                                      By:_______________________________________
                                         Vice President, Director of Accounting,
                                         and Treasurer

   

<PAGE>   1
                                                                     EXHIBIT (E)

                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1994-3 Monthly Statement
                      Class A Certificate CUSIP #25466KAL3
                      Class B Certificate CUSIP #25466KAM1


Trust Distribution Date: May 15, 1998        Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of October 20, 1994 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
     Series  1994-3                                                             Total                Interest          Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 5.846250000%                            $4.871875000          $4.871875000      $0.000000000

             Class B      30 days at 7.750000000%                            $6.458333333          $6.458333333      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                           <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00

          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1994-3 Investor Interest                                                                         $789,474,000.00

      (e) Class A Investor Interest                                                                               $750,000,000.00

          Class B Investor Interest                                                                                $39,474,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                          Finance Charge          Principal              Yield
                                                                            Collections          Collections           Collections
<S>                                                                       <C>                 <C>                      <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                                   $275,244,468.65     $2,127,916,652.24             $0.00

          Seller                                                           $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1994-3 Allocations                                        $12,428,037.09        $96,081,229.98             $0.00

      (e) Class A Allocations                                              $11,818,819.59        $91,371,365.77             $0.00

          Class B Allocations                                                 $609,217.50         $4,709,864.21             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                           Deposits into the
                                                              SPFAs This             SPFA             Deposit Deficit    Investment
                                                              Due Period            Balance               Amount           Income
<S>                                                        <C>                      <C>               <C>                <C>  
          Series 1994-3                                         $0.00               $0.00                  0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                      Total Payments
                                                                                 Amount Paid        Deficit Amount     Through This
                                                                              This Due Period       This Due Period     Due Period
<S>                                                                           <C>                   <C>               <C>  
          Series 1994-3                                                             $0.00                 $0.00            $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                                Deposits Into the
                                                                                                   SIFAs This
                                                                                                   Due Period        SIFA Balance
<S>                                                                                             <C>                  <C>  
          Series 1994-3                                                                          $3,908,842.50           $0.00
</TABLE>

7.   Pool Factors
<TABLE>
<CAPTION>
                                                                                                                    This Due Period
<S>                                                                                                                    <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                    Cumulative
                                                                                                               Investor Charged-Off
                                                                                           This Due Period            Amount
<S>                                                                                        <C>                 <C>  
      (a) Group One                                                                         $80,595,713.85             $0.00

      (b) Group Two                                                                         $13,787,758.20             $0.00

      (c) Series 1994-3                                                                      $4,261,670.72             $0.00

      (d) Class A                                                                            $4,052,765.29             $0.00

          Class B                                                                              $208,905.43             $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                   Per $1,000 of
                                                                                                                 Original Invested
                                                                                                     Total           Principal
<S>                                                                                                  <C>          <C>  
      (a) Group One                                                                                  $0.00             $0.00

      (b) Group Two                                                                                  $0.00             $0.00

      (c) Series 1994-3                                                                              $0.00             $0.00

      (d) Class A                                                                                    $0.00             $0.00

          Class B                                                                                    $0.00             $0.00
</TABLE>


<PAGE>   3
10.  Reimbursement of Investor Losses This Due Period
<TABLE>
<CAPTION>
                                                                                                                     Per $1,000 of
                                                                                                                   Original Invested
                                                                                                          Total        Principal
<S>                                                                                                      <C>       <C>  
      (a) Group One                                                                                       $0.00          $0.00

      (b) Group Two                                                                                       $0.00          $0.00

      (c) Series 1994-3                                                                                   $0.00          $0.00

      (d) Class A                                                                                         $0.00          $0.00

          Class B                                                                                         $0.00          $0.00
</TABLE>

11.  Aggregate Amount of Unreimbursed Investor Losses

<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total        Principal
<S>                                                                                                      <C>      <C>  
      (a) Group One                                                                                       $0.00          $0.00

      (b) Group Two                                                                                       $0.00          $0.00

      (c) Series 1994-3                                                                                   $0.00          $0.00

      (d) Class A                                                                                         $0.00          $0.00

          Class B                                                                                         $0.00          $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                               <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1994-3                                                                                             $1,315,790.00

      (d) Class A                                                                                                   $1,250,000.00

          Class B                                                                                                      $65,790.00
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                   As a Percentage
                                                                                                                      of Class A
                                                                                                     Total         Invested Amount
<S>                                                                                              <C>               <C>     
     Series 1994-3 Class B                                                                       $83,131,612.20        11.0842%
</TABLE>

14.  Total Available Credit Enhancement Amounts


<TABLE>
<CAPTION>
                                                                                                    Shared Amount  Class B Amount
<S>                                                                                                  <C>           <C>           
     Maximum Amount                                                                                     $0.00      $39,473,700.00

     Available Amount                                                                                   $0.00      $39,473,700.00

     Amount of Drawings on Credit Enhancement
       for this Due Period                                                                              $0.00               $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
     End of Due Period Master Trust Receivables Outstanding                                                    $20,448,816,201.71
</TABLE>

<TABLE>
<CAPTION>
                                                                        Delinquent Amount         Percentage of Ending
     Payment Status                                                        Ending Balance         Receivables Outstanding
<S>                                                                     <C>                       <C>  
     30-59 days                                                           $578,496,902.86                  2.83%

     60-179 days                                                          $890,849,726.42                  4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: ____________________________
                                            Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1994-3 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the "Pooling & Servicing Agreement") and
the Series Supplement, dated as of October 20, 1994 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1994-3 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:

<TABLE>
<S>                                                                                                            <C>
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                                    $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                                       $91,371,365.77

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                                                $11,818,819.59

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                                             $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                                    $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                                 $3,653,906.25
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                                                <C>
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                                        $4,709,864.21

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                                   $609,217.50

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                                             $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                                    $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                                   $254,936.25

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                      GREENWOOD TRUST COMPANY
                                      as Master Servicer

                                      By:____________________________________
                                         Vice President, Director of Accounting,
                                         and Treasurer


<PAGE>   1
                                                                     EXHIBIT (F)


                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1994-A Monthly Statement


Trust Distribution Date: May 15, 1998        Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of December 20, 1994 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
     Series  1994-A                                                              Total                Interest         Principal
<S>                                                                         <C>                   <C>               <C>         
     Class A          30 days at 5.733947050%                                $4.778289208          $4.778289208      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                            <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1994-A Investor Interest                                                                       $2,550,000,000.00

      (e) Class A Investor Interest                                                                             $2,550,000,000.00

          Class B Investor Interest                                                                                         $0.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                           Finance Charge        Principal               Yield
                                                                            Collections         Collections           Collections
<S>                                                                      <C>                 <C>                      <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                                   $275,244,468.65     $2,127,916,652.24             $0.00

          Seller                                                           $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1994-A Allocations                                        $40,208,355.33       $310,851,038.17             $0.00

      (e) Class A Allocations                                              $40,208,355.33       $310,851,038.17             $0.00

          Class B Allocations                                                       $0.00                 $0.00             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")
<TABLE>
<CAPTION>
                    Deposits into the SPFAs
                                                              This Due              Total            Deposit Deficit     Investment
                                                                Period            Deposits                 Amount           Income
<S>                                                           <C>                 <C>                <C>                 <C>  
          Series 1994-A                                         $0.00               $0.00                  0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                     Total Payments
                                                                               Amount Paid           Deficit Amount   Through This
                                                                              This Due Period        This Due Period    Due Period
<S>                                                                           <C>                    <C>             <C>  
          Series 1994-A                                                             $0.00                 $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                              Deposits Into the
                                                                                                  SIFAs This
                                                                                                  Due Period           SIFA Balance
<S>                                                                                           <C>                      <C>  
          Series 1994-A                                                                          $12,184,637.48             $0.00
</TABLE>

7.   Pool Factors

<TABLE>
<CAPTION>
                                                                                                                   This Due Period
<S>                                                                                                                <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      0.00000000
</TABLE>

8.   Investor Charged-Off Amount
<TABLE>
<CAPTION>
                                                                                                                        Cumulative
                                                                                                                         Investor
                                                                                                                        Charged-Off
                                                                                                This Due Period            Amount
<S>                                                                                             <C>                        <C>  
      (a) Group One                                                                              $80,595,713.85             $0.00

      (b) Group Two                                                                              $13,787,758.20             $0.00

      (c) Series 1994-A                                                                          $13,787,758.20             $0.00

      (d) Class A                                                                                $13,787,758.20             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                   Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total      Principal
<S>                                                                                                      <C>      <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1994-A                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>


<PAGE>   3
<TABLE>
<CAPTION>
                                                                                                      

10.  Reimbursement of Investor Losses This Due Period                                                                Per $1,000 of
                                                                                                                  Original Invested 
                                                                                                          Total        Principal
<S>                                                                                                      <C>          <C>  
      (a) Group One                                                                                       $0.00          $0.00

      (b) Group Two                                                                                       $0.00          $0.00

      (c) Series 1994-A                                                                                   $0.00          $0.00

      (d) Class A                                                                                         $0.00          $0.00

          Class B                                                                                         $0.00          $0.00
</TABLE>

11.  Aggregate Amount of Unreimbursed Investor Losses 
<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total       Principal
<S>                                                                                                       <C>         <C>  
      (a) Group One                                                                                       $0.00          $0.00

      (b) Group Two                                                                                       $0.00          $0.00

      (c) Series 1994-A                                                                                   $0.00          $0.00

      (d) Class A                                                                                         $0.00          $0.00

          Class B                                                                                         $0.00          $0.00
</TABLE>


12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                             <C>           
      (a) Group One                                                                                             $24,854,402.77

      (b) Group Two                                                                                              $4,250,000.00

      (c) Series 1994-A                                                                                          $4,250,000.00

      (d) Class A                                                                                                $4,250,000.00

          Class B                                                                                                        $0.00
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                   As a Percentage
                                                                                                                       of Class A
                                                                                                          Total     Invested Amount
<S>                                                                                                      <C>         <C>    
          Series 1994-A Class B                                                                           $0.00         0.0000%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                 Shared Amount      Class B Amount
<S>                                                                                             <C>                 <C>  
          Maximum Amount                                                                        $204,000,000.00          $0.00

          Available Amount                                                                      $204,000,000.00          $0.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                            $0.00          $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
          End of Due Period Master Trust Receivables Outstanding                                               $20,448,816,201.71
</TABLE>


<TABLE>
<CAPTION>
                                                                         Delinquent Amount        Percentage of Ending
          Payment Status                                                   Ending Balance       Receivables Outstanding
<S>                                                                      <C>                    <C>  
          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                            Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1994-A Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the"Pooling & Servicing Agreement") and
the Series Supplement, dated as of December 20, 1994 (the "Series Supplement")
by and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1994-A Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<S>                                                                                                            <C>
1.   Greenwood is Master Servicer under the Pooling and Servicing Agreement.

2.   The undersigned is a Servicing Officer of Greenwood as Master Servicer.

3.   The aggregate amount of Collections processed during the related Due Period
     is equal to                                                                                                $2,659,540,859.87

4.   The aggregate amount of Class A Principal Collections processed during the
     related Due Period is equal to                                                                               $310,851,038.17

5.   The aggregate amount of Class A Finance Charge Collections processed during
     the related Due Period is equal to                                                                            $40,208,355.33

6a.  The aggregate amount of Class A Principal Collections recharacterized as
     Series Yield Collections during the related Due Period is equal to                                                     $0.00

6b.  The aggregate amount of Class A Additional Funds for this Distribution Date
     is equal to                                                                                                            $0.00

7.   The sum of all amounts payable to the Class A Certificateholders on the
     current Distribution Date is equal to                                                                         $12,184,637.48

8.   The amount of drawings under the Credit Enhancement required to be made on
     the related Drawing Date pursuant to the Series Supplement:

     (a)  with respect to the Class A Required Amount Shortfall                                                             $0.00
          is equal to

     (b)  with respect to the Class A Cumulative Investor Charged-Off                                                       $0.00
          Amount is equal to

     (c)  with respect to the Class A Investor Interest is equal to                                                         $0.00
</TABLE>


<PAGE>   6
9.   Attached hereto is a true copy of the statement required to be delivered by
     the Master Servicer on the date of this Certificate to the Trustee pursuant
     to Section 16 of the Series Supplement.

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                         as Master Servicer

                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (G)


                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1995-1 Monthly Statement
                      Class A Certificate CUSIP #25466KAN9
                      Class B Certificate CUSIP #25466KAP4


Trust Distribution Date: May 15, 1998         Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of April 19, 1995 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
          Series  1995-1                                                         Total               Interest         Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 5.936250000%                            $4.946875000          $4.946875000      $0.000000000
             Class B      30 days at 6.106250000%                            $5.088541667          $5.088541667      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                            <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1995-1 Investor Interest                                                                         $631,579,000.00

      (e) Class A Investor Interest                                                                               $600,000,000.00

          Class B Investor Interest                                                                                $31,579,000.00
</TABLE>


     3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                          Finance Charge         Principal                 Yield
                                                                            Collections         Collections            Collections
<S>                                                                       <C>                 <C>                      <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation.                                  $275,244,468.65     $2,127,916,652.24             $0.00

          Seller:                                                          $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1995-1 Allocations                                         $9,930,245.33        $76,770,786.70             $0.00

      (e) Class A Allocations                                               $9,442,871.33        $73,002,895.33             $0.00

          Class B Allocations                                                 $487,374.00         $3,767,891.37             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")
<TABLE>
<CAPTION>
                                                         Deposits into the
                                                               SPFAs This             SPFA           Deposit Deficit    Investment
                                                              Due Period            Balance               Amount            Income
<S>                                                      <C>                        <C>              <C>                <C>  
          Series 1995-1                                         $0.00               $0.00                  0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                      Total Payments
                                                                                 Amount Paid          Deficit Amount   Through This
                                                                              This Due Period        This Due Period     Due Period
<S>                                                                           <C>                    <C>              <C>  
          Series 1995-1                                                             $0.00                 $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                                Deposits Into the
                                                                                                   SIFAs This
                                                                                                   Due Period         SIFA Balance
<S>                                                                                               <C>                  <C>  
          Series 1995-1                                                                           $3,128,816.06             $0.00
</TABLE>

7.   Pool Factors
<TABLE>
                                                                                                                    This Due Period
<S>                                                                                                                    <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                       Cumulative
                                                                                                                Investor Charged-Off
                                                                                                This Due Period          Amount
<S>                                                                                             <C>             <C>  
      (a) Group One                                                                              $80,595,713.85             $0.00

      (b) Group Two                                                                              $13,787,758.20             $0.00

      (c) Series 1995-1                                                                           $3,405,158.46             $0.00

      (d) Class A                                                                                 $3,238,034.12             $0.00

          Class B                                                                                   $167,124.34             $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                     Per $1,000 of
                                                                                                                   Original Invested
                                                                                                          Total        Principal
<S>                                                                                                       <C>        <C>  
      (a) Group One                                                                                       $0.00          $0.00

      (b) Group Two                                                                                       $0.00          $0.00

      (c) Series 1995-1                                                                                   $0.00          $0.00

      (d) Class A                                                                                         $0.00          $0.00

          Class B                                                                                         $0.00          $0.00

</TABLE>


<PAGE>   3

<TABLE>
<CAPTION>
10.  Reimbursement of Investor Losses This Due Period                                                                Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total           Principal
<S>                                                                                                       <C>     <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1995-1                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

<TABLE>
<CAPTION>
11.  Aggregate Amount of Unreimbursed Investor Losses                                                                Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total          Principal
<S>                                                                                                       <C>     <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1995-1                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                                <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1995-1                                                                                             $1,052,631.67

      (d) Class A                                                                                                   $1,000,000.00

          Class B                                                                                                      $52,631.67
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                   As a Percentage
                                                                                                                       of Class A
                                                                                                      Total         Invested Amount
<S>                                                                                              <C>                <C>     
          Series 1995-1 Class B                                                                  $69,473,690.00           11.5789%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                     Shared Amount  Class B Amount
<S>                                                                                                  <C>            <C>           
          Maximum Amount                                                                                  $0.00    $37,894,740.00

          Available Amount                                                                                $0.00    $37,894,740.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                            $0.00             $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
     End of Due Period Master Trust Receivables Outstanding                                                    $20,448,816,201.71
</TABLE>

<TABLE>
<CAPTION>
                                                                                               
                                                                         Delinquent Amount          Percentage of Ending
          Payment Status                                                  Ending Balance          Receivables Outstanding
<S>                                                                       <C>                     <C>  
          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>

                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                            Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1995-1 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the"Pooling & Servicing Agreement") and
the Series Supplement, dated as of April 19, 1995 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1995-1 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<S>                                                                                                            <C> 
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                                    $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                                       $73,002,895.33

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                                                 $9,442,871.33

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                                    $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                                 $2,968,125.00
</TABLE>


<PAGE>   6

<TABLE>
<S>                                                                                                                <C>
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                                        $3,767,891.37

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                                   $487,374.00

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                                    $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                                   $160,691.06

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                        as Master Servicer

                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (H)


                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1995-2 Monthly Statement
                      Class A Certificate CUSIP #25466KAQ2
                      Class B Certificate CUSIP #25466KAR0


Trust Distribution Date: May 15, 1998         Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of August 1, 1995 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
     Series  1995-2                                                              Total               Interest          Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 6.550000000%                            $5.458333333          $5.458333333      $0.000000000

             Class B      30 days at 6.750000000%                            $5.625000000          $5.625000000      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                           <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1995-2 Investor Interest                                                                         $526,316,000.00

      (e) Class A Investor Interest                                                                               $500,000,000.00

          Class B Investor Interest                                                                                $26,316,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period


<TABLE>
<CAPTION>
                                                                          Finance Charge         Principal              Yield
                                                                            Collections         Collections           Collections
<S>                                                                       <C>                 <C>                     <C>  
      (a) Allocation of Collections between Investor and Seller
          Aggregate Investor Allocation.                                  $275,244,468.65     $2,127,916,652.24             $0.00

          Seller                                                           $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1995-2 Allocations                                         $8,315,818.94        $64,289,646.53             $0.00

      (e) Class A Allocations                                               $7,889,366.69        $60,992,741.58             $0.00

          Class B Allocations                                                 $426,452.25         $3,296,904.95             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")


<TABLE>
<CAPTION>
                                                         Deposits into the
                                                             SPFAs This              SPFA             Deposit Deficit    Investment
                                                             Due Period            Balance                Amount           Income
<S>                                                      <C>                       <C>                <C>                <C>  
          Series 1995-2                                         $0.00               $0.00                 $0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments


<TABLE>
<CAPTION>
                                                                                                                      Total Payments
                                                                               Amount Paid         Deficit Amount      Through This
                                                                             This Due Period      This Due Period       Due Period
<S>                                                                          <C>                     <C>                  <C>  
          Series 1995-2                                                             $0.00             $0.00               $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                                Deposits Into the
                                                                                                   SIFAs This
                                                                                                   Due Period        SIFA Balance
<S>                                                                                               <C>               <C>          
          Series 1995-2                                                                           $2,877,194.17     $8,631,582.51
</TABLE>

7.   Pool Factors 

<TABLE>
<CAPTION>
                                                                                                                  This Due Period
<S>                                                                                                                  <C>       
          Class A                                                                                                     1.00000000

          Class B                                                                                                     1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                   Cumulative
                                                                                                              Investor Charged-Off
                                                                                         This Due Period             Amount
<S>                                                                                      <C>                         <C>  
      (a) Group One                                                                       $80,595,713.85             $0.00

      (b) Group Two                                                                       $13,787,758.20             $0.00

      (c) Series 1995-2                                                                    $2,851,559.08             $0.00

      (d) Class A                                                                          $2,705,325.28             $0.00

          Class B                                                                            $146,233.80             $0.00
</TABLE>


9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                Per $1,000 of
                                                                                             Original Invested
                                                                            Total                Principal
<S>                                                                         <C>                    <C>  
      (a) Group One                                                         $0.00                  $0.00

      (b) Group Two                                                         $0.00                  $0.00

      (c) Series 1995-2                                                     $0.00                  $0.00

      (d) Class A                                                           $0.00                  $0.00

          Class B                                                           $0.00                  $0.00
</TABLE>


<PAGE>   3
<TABLE>
<CAPTION>
10.  Reimbursement of Investor Losses This Due Period                                                                Per $1,000 of
                                                                                                                   Original Invested
                                                                                                          Total         Principal
<S>                                                                                                      <C>              <C>  
      (a) Group One                                                                                       $0.00           $0.00

      (b) Group Two                                                                                       $0.00           $0.00

      (c) Series 1995-2                                                                                   $0.00           $0.00

      (d) Class A                                                                                         $0.00           $0.00

          Class B                                                                                         $0.00           $0.00
</TABLE>


<TABLE>
<CAPTION>
11.  Aggregate Amount of Unreimbursed Investor Losses                                                                Per $1,000 of
                                                                                                                   Original Invested
                                                                                                          Total         Principal
<S>                                                                                                      <C>              <C>  
      (a) Group One                                                                                       $0.00           $0.00

      (b) Group Two                                                                                       $0.00           $0.00

      (c) Series 1995-2                                                                                   $0.00           $0.00

      (d) Class A                                                                                         $0.00           $0.00

          Class B                                                                                         $0.00           $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period


<TABLE>
<S>                                                                                                               <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1995-2                                                                                               $877,193.33

      (d) Class A                                                                                                     $833,333.33

          Class B                                                                                                      $43,860.00
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                  As a Percentage
                                                                                                                      of Class A
                                                                                                      Total        Invested Amount
<S>                                                                                              <C>              <C>    
          Series 1995-2 Class B                                                                  $34,210,540.00            6.8421%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                  Shared Amount    Class B Amount
<S>                                                                                                  <C>           <C>
          Maximum Amount                                                                              $0.00        $15,789,480.00

          Available Amount                                                                            $0.00        $15,789,480.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                        $0.00                 $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
     End of Due Period Master Trust Receivables Outstanding                                                    $20,448,816,201.71
</TABLE>


<TABLE>
<CAPTION>
                                                                         Delinquent Amount       Percentage of Ending
          Payment Status                                                   Ending Balance       Receivables Outstanding
<S>                                                                      <C>                    <C>  
          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                            Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1995-2 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the"Pooling & Servicing Agreement") and
the Series Supplement, dated as of August 1, 1995 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1995-2 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<S>                                                                                                            <C>
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                                    $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                                       $60,992,741.58

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                                                 $7,889,366.69

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                                    $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                                         $0.00
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                                                 <C>
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                                        $3,296,904.95

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                                   $426,452.25

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                                        $0.00 
               is equal to


          (b)  with respect to the Class B Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                                    $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                                         $0.00

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                        as Master Servicer

                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (I)


                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1995-3 Monthly Statement
                      Class A Certificate CUSIP #25466KAS8
                      Class B Certificate CUSIP #25466KAT6


Trust Distribution Date: May 15, 1998          Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of September 28, 1995 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)


<TABLE>
<CAPTION>
          Series  1995-3                                                         Total               Interest          Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 5.866250000%                            $4.888541667          $4.888541667      $0.000000000

             Class B      30 days at 5.986250000%                            $4.988541667          $4.988541667      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                           <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1995-3 Investor Interest                                                                         $526,316,000.00

      (e) Class A Investor Interest                                                                               $500,000,000.00

          Class B Investor Interest                                                                                $26,316,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                           Finance Charge        Principal                Yield
                                                                            Collections         Collections            Collections
<S>                                                                       <C>                 <C>                      <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                                   $275,244,468.65     $2,127,916,652.24             $0.00

          Seller                                                           $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1995-3 Allocations                                         $8,315,818.94        $64,289,646.53             $0.00

      (e) Class A Allocations                                               $7,889,366.69        $60,992,741.58             $0.00

          Class B Allocations                                                 $426,452.25         $3,296,904.95             $0.00
</TABLE>


<PAGE>   2

4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                        Deposits into the
                                                            SPFAs This              SPFA              Deposit Deficit    Investment
                                                            Due Period             Balance                Amount            Income
<S>                                                     <C>                        <C>                <C>                <C>  
          Series 1995-3                                         $0.00               $0.00                  $0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments
<TABLE>
<CAPTION>
                                                                                                                     Total Payments
                                                                                 Amount Paid          Deficit Amount   Through This
                                                                              This Due Period        This Due Period    Due Period
<S>                                                                           <C>                    <C>             <C>  
          Series 1995-3                                                             $0.00                 $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")


<TABLE>
<CAPTION>
                                                                                                Deposits Into the
                                                                                                   SIFAs This
                                                                                                   Due Period          SIFA Balance
<S>                                                                                               <C>             <C>  
          Series 1995-3                                                                           $2,575,549.29            $0.00
</TABLE>

7.   Pool Factors

<TABLE>
<CAPTION> 
                                                                                                                   This Due Period
<S>                                                                                                                   <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                     Cumulative
                                                                                                                Investor Charged-Off
                                                                                                This Due Period       Amount
<S>                                                                                             <C>             <C>  
      (a) Group One                                                                              $80,595,713.85            $0.00

      (b) Group Two                                                                              $13,787,758.20            $0.00

      (c) Series 1995-3                                                                           $2,851,559.08            $0.00

      (d) Class A                                                                                 $2,705,325.28            $0.00

          Class B                                                                                   $146,233.80            $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total        Principal
<S>                                                                                                      <C>       <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1995-3                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>


<PAGE>   3

10.  Reimbursement of Investor Losses This Due Period
<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total       Principal
<S>                                                                                                       <C>     <C>  
      (a) Group One                                                                                       $0.00         $0.00

      (b) Group Two                                                                                       $0.00         $0.00

      (c) Series 1995-3                                                                                   $0.00         $0.00

      (d) Class A                                                                                         $0.00         $0.00

          Class B                                                                                         $0.00         $0.00
</TABLE>

11.  Aggregate Amount of Unreimbursed Investor Losses
<TABLE>
<CAPTION>

                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total       Principal
<S>                                                                                                      <C>      <C>  
      (a) Group One                                                                                       $0.00         $0.00

      (b) Group Two                                                                                       $0.00         $0.00

      (c) Series 1995-3                                                                                   $0.00         $0.00

      (d) Class A                                                                                         $0.00         $0.00

          Class B                                                                                         $0.00         $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                                <C>
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1995-3                                                                                               $877,193.33

      (d) Class A                                                                                                     $833,333.33

          Class B                                                                                                      $43,860.00
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                   As a Percentage
                                                                                                                     of Class A
                                                                                                      Total        Invested Amount
<S>                                                                                              <C>               <C>     
          Series 1995-3 Class B                                                                  $57,894,760.00        11.5790%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                    Shared Amount   Class B Amount
<S>                                                                                                 <C>       `    <C>           
          Maximum Amount                                                                                  $0.00    $31,578,960.00

          Available Amount                                                                                $0.00    $31,578,960.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                            $0.00             $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
     End of Due Period Master Trust Receivables Outstanding                                                    $20,448,816,201.71
</TABLE>

<TABLE>
<CAPTION>
                                                                        Delinquent Amount         Percentage of Ending
          Payment Status                                                   Ending Balance        Receivables Outstanding
<S>                                                                     <C>                      <C>  
          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                            Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1995-3 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the"Pooling & Servicing Agreement") and
the Series Supplement, dated as of September 28, 1995 (the "Series Supplement")
by and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1995-3 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:

<TABLE>
<S>                                                                                                           <C> 
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                                    $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                                       $60,992,741.58

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                                                 $7,889,366.69

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                                    $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                                 $2,444,270.83
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                                                 <C> 
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                                        $3,296,904.95

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                                   $426,452.25

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                                        $0.00 
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                                    $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                                   $131,278.46

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                        as Master Servicer

                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (J)


                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1996-1 Monthly Statement
                      Class A Certificate CUSIP #25466KAU3
                      Class B Certificate CUSIP #25466KAV1


Trust Distribution Date: May 15, 1998        Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of January 18, 1996 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

     1.   Payments for the benefit of Series Investors this Due Period (per
          $1000 of Class Initial Investor Interest)

<TABLE>
<CAPTION>
          Series  1996-1                                                         Total                Interest         Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 5.826250000%                            $4.855208333          $4.855208333      $0.000000000

             Class B      30 days at 5.956250000%                            $4.963541667          $4.963541667      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                            <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1996-1 Investor Interest                                                                       $1,052,632,000.00

      (e) Class A Investor Interest                                                                             $1,000,000,000.00

          Class B Investor Interest                                                                                $52,632,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                           Finance Charge        Principal                 Yield
                                                                            Collections          Collections            Collections
<S>                                                                       <C>                 <C>                       <C>  
      (a) Allocation of Collections between Investor and Seller
          Aggregate Investor Allocation                                   $275,244,468.65     $2,127,916,652.24             $0.00

          Seller                                                           $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1996-1 Allocations                                        $16,570,716.13       $128,108,306.64             $0.00

      (e) Class A Allocations                                              $15,748,272.50       $121,749,989.95             $0.00

          Class B Allocations                                                 $822,443.63         $6,358,316.69             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                       Deposits into the
                                                          SPFAs This                SPFA             Deposit Deficit     Investment
                                                          Due Period               Balance                Amount            Income
<S>                                                    <C>                         <C>               <C>                 <C>  
          Series 1996-1                                         $0.00               $0.00                 $0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                    Total Payments
                                                                          Amount Paid          Deficit Amount        Through This
                                                                        This Due Period       This Due Period         Due Period
<S>                                                                     <C>                   <C>                  <C>  
          Series 1996-1                                                       $0.00                 $0.00                 $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                                                  Deposits Into the
                                                                                                                     SIFAs This
                                                                                               Due Period           SIFA Balance
<S>                                                                                           <C>                 <C>  
          Series 1996-1                                                                       $5,116,449.46                 $0.00
</TABLE>

7.   Pool Factors

<TABLE>
<CAPTION>
                                                                                                                  This Due Period
<S>                                                                                                               <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                    Cumulative
                                                                                                                Investor Charged-Off
                                                                                         This Due Period              Amount
<S>                                                                                      <C>                    <C>  
      (a) Group One                                                                       $80,595,713.85                    $0.00

      (b) Group Two                                                                       $13,787,758.20                    $0.00

      (c) Series 1996-1                                                                    $5,682,227.63                    $0.00

      (d) Class A                                                                          $5,400,205.30                    $0.00

          Class B                                                                            $282,022.33                    $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                                Total                 Principal
<S>                                                                                             <C>               <C>  
      (a) Group One                                                                             $0.00                       $0.00

      (b) Group Two                                                                             $0.00                       $0.00

      (c) Series 1996-1                                                                         $0.00                       $0.00

      (d) Class A                                                                               $0.00                       $0.00

          Class B                                                                               $0.00                       $0.00
</TABLE>


<PAGE>   3
10.  Reimbursement of Investor Losses This Due Period
<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total       Principal
<S>                                                                                                      <C>      <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1996-1                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

11.  Aggregate Amount of Unreimbursed Investor Losses
<TABLE>
<CAPTION>
                                                                                                                  Per $1,000 of
                                                                                                                 Original Invested
                                                                                                          Total      Principal
<S>                                                                                                       <C>    <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1996-1                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                               <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1996-1                                                                                             $1,754,386.67

      (d) Class A                                                                                                   $1,666,666.67

          Class B                                                                                                      $87,720.00
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                  As a Percentage
                                                                                                                     of Class A
                                                                                                     Total        Invested Amount
<S>                                                                                             <C>                  <C>     
          Series 1996-1 Class B                                                                 $105,263,200.00        10.5263%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                    Shared Amount  Class B Amount
<S>                                                                                                 <C>            <C>           
          Maximum Amount                                                                                  $0.00    $57,894,760.00

          Available Amount                                                                                $0.00    $57,894,760.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                            $0.00             $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
          End of Due Period Master Trust Receivables Outstanding                                               $20,448,816,201.71
</TABLE>


<TABLE>
<CAPTION>
                                                                         Delinquent Amount   Percentage of Ending
          Payment Status                                                   Ending Balance   Receivables Outstanding
<S>                                                                      <C>                <C>  
          30-59 days                                                      $578,496,902.86                 2.83%

          60-179 days                                                     $890,849,726.42                 4.36%
</TABLE>

                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                            Vice President
 

<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1996-1 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the "Pooling & Servicing Agreement") and
the Series Supplement, dated as of January 18, 1996 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1996-1 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<S>                                                                                                            <C> 
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                                    $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                                      $121,749,989.95

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                                                $15,748,272.50

     6 a. The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                                             $0.00

     6 b. The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                                    $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                                 $4,855,208.33
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                                                 <C> 
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                                        $6,358,316.69

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                                   $822,443.63

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                                             $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                                    $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                                   $261,241.13

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                          as Master Servicer

                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (K)

                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1996-2 Monthly Statement
                      Class A Certificate CUSIP #25466KAW9
                      Class B Certificate CUSIP #25466KAX7


Trust Distribution Date: May 15, 1998        Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of January 29, 1996 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
          Series  1996-2                                                        Total                Interest          Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 5.876250000%                            $4.896875000          $4.896875000      $0.000000000

             Class B      30 days at 6.016250000%                            $5.013541667          $5.013541667      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<CAPTION>
<S>                                                                                                            <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1996-2 Investor Interest                                                                         $947,369,000.00

      (e) Class A Investor Interest                                                                               $900,000,000.00

          Class B Investor Interest                                                                                $47,369,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                           Finance Charge          Principal              Yield
                                                                            Collections           Collections         Collections
<S>                                                                       <C>                 <C>                     <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                                   $275,244,468.65     $2,127,916,652.24             $0.00

          Seller                                                           $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1996-2 Allocations                                        $14,956,289.74       $115,627,166.48             $0.00

      (e) Class A Allocations                                              $14,194,767.86       $109,739,836.21             $0.00

          Class B Allocations                                                 $761,521.88         $5,887,330.27             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                          Deposits into the
                                                              SPFAs This            SPFA              Deposi Deficit      Investment
                                                             Due Period            Balance                Amount            Income
<S>                                                      <C>                       <C>                <C>                 <C>  
          Series 1996-2                                         $0.00               $0.00                  $0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                      Total Payments
                                                                                Amount Paid          Deficit Amount    Through This
                                                                              This Due Period       This Due Period     Due Period
<S>                                                                           <C>                   <C>               <C>  
          Series 1996-2                                                            $0.00                 $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")


<TABLE>
<CAPTION>
                                                                                               Deposits Into the
                                                                                                   SIFAs This
                                                                                                   Due Period          SIFA Balance
<S>                                                                                            <C>                     <C>  
          Series 1996-2                                                                           $4,644,673.96            $0.00
</TABLE>


7.   Pool Factors
<TABLE>
<CAPTION>

                                                                                                                  This Due Period
<S>                                                                                                               <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                     Cumulative
                                                                                                                Investor Charged-Off
                                                                                           This Due Period             Amount
<S>                                                                                        <C>                  <C>  
      (a) Group One                                                                         $80,595,713.85              $0.00

      (b) Group Two                                                                         $13,787,758.20              $0.00

      (c) Series 1996-2                                                                      $5,128,628.24              $0.00

      (d) Class A                                                                            $4,867,496.46              $0.00

          Class B                                                                              $261,131.78              $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                   Per $1,000 of
                                                                                                                 Original Invested
                                                                                                      Total          Principal
<S>                                                                                                   <C>        <C>  
      (a) Group One                                                                                   $0.00             $0.00

      (b) Group Two                                                                                   $0.00             $0.00

      (c) Series 1996-2                                                                               $0.00             $0.00

      (d) Class A                                                                                     $0.00             $0.00

          Class B                                                                                     $0.00             $0.00
</TABLE>


<PAGE>   3
10.  Reimbursement of Investor Losses This Due Period
<TABLE>
<CAPTION>
                                                                                                                   Per $1,000 of
                                                                                                                 Original Invested
                                                                                                      Total          Principal
<S>                                                                                                   <C>        <C>  
      (a) Group One                                                                                   $0.00            $0.00

      (b) Group Two                                                                                   $0.00            $0.00

      (c) Series 1996-2                                                                               $0.00            $0.00

      (d) Class A                                                                                     $0.00            $0.00

          Class B                                                                                     $0.00            $0.00
</TABLE>

11.  Aggregate Amount of Unreimbursed Investor Losses
<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                                      Total            Principal
<S>                                                                                                   <C>         <C>  
      (a) Group One                                                                                   $0.00              $0.00

      (b) Group Two                                                                                   $0.00              $0.00

      (c) Series 1996-2                                                                               $0.00              $0.00

      (d) Class A                                                                                     $0.00              $0.00

          Class B                                                                                     $0.00              $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period
<TABLE>
<S>                                                                                                                <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1996-2                                                                                             $1,578,948.33

      (d) Class A                                                                                                   $1,500,000.00

          Class B                                                                                                      $78,948.33
</TABLE>


13.  Class Available Subordinated Amount at the end of the Due Period
<TABLE>
<CAPTION>
                                                                                                                    As a Percentage
                                                                                                                       of Class A
                                                                                                    Total           Invested Amount
<S>                                                                                             <C>                 <C>     
          Series 1996-2 Class B                                                                 $104,210,590.00         11.5790%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                   Shared Amount  Class B Amount
<S>                                                                                                <C>            <C>           
          Maximum Amount                                                                                $0.00     $56,842,140.00

          Available Amount                                                                              $0.00     $56,842,140.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                          $0.00              $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
     End of Due Period Master Trust Receivables Outstanding                                                    $20,448,816,201.71
</TABLE>

<TABLE>
<CAPTION>
                                                                         Delinquent Amount         Percentage of Ending
          Payment Status                                                  Ending Balance          Receivables Outstanding
<S>                                                                      <C>                      <C>  
          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>



                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                            Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1996-2 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the"Pooling & Servicing Agreement") and
the Series Supplement, dated as of January 29, 1996 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1996-2 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<S>                                                                                                            <C>
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                                    $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                                      $109,739,836.21

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                                                $14,194,767.86

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                                    $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                                 $4,407,187.50
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                                                <C>
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                                        $5,887,330.27

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                                   $761,521.88

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                                    $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                                   $237,486.46

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                        as Master Servicer

                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (L)


                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1996-3 Monthly Statement
                      Class A Certificate CUSIP #25466KAY5
                      Class B Certificate CUSIP #25466KAZ2


Trust Distribution Date: May 15, 1998         Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of February 21, 1996 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
          Series  1996-3                                                         Total               Interest          Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 6.050000000%                            $5.041666667          $5.041666667      $0.000000000

             Class B      30 days at 6.250000000%                            $5.208333333          $5.208333333      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                           <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1996-3 Investor Interest                                                                         $631,579,000.00

      (e) Class A Investor Interest                                                                               $600,000,000.00

          Class B Investor Interest                                                                                $31,579,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                           Finance Charge        Principal                Yield
                                                                             Collections        Collections            Collections
<S>                                                                       <C>                 <C>                      <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation.                                  $275,244,468.65     $2,127,916,652.24             $0.00

          Seller:                                                          $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1996-3 Allocations                                         $9,930,245.33        $76,770,786.70             $0.00

      (e) Class A Allocations                                               $9,442,871.33        $73,002,895.33             $0.00

          Class B Allocations                                                 $487,374.00         $3,767,891.37             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                          Deposits into the
                                                              SPFAs This             SPFA            Deposit Deficit     Investment
                                                              Due Period            Balance                Amount           Income
<S>                                                       <C>                       <C>              <C>                 <C>  
          Series 1996-3                                         $0.00               $0.00                  0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                     Total Payments
                                                                                Amount Paid          Deficit Amount    Through This
                                                                             This Due Period        This Due Period     Due Period
<S>                                                                          <C>                    <C>              <C>  
          Series 1996-3                                                             $0.00                 $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                               Deposits Into the
                                                                                                   SIFAs This
                                                                                                   Due Period       SIFA Balance
<S>                                                                                            <C>                 <C>          
         Series 1996-3                                                                           $3,189,473.96     $9,568,421.88
</TABLE>

7.   Pool Factors

<TABLE>
<CAPTION>
                                                                                                                  This Due Period
<S>                                                                                                               <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                     Cumulative
                                                                                                                Investor Charged-Off
                                                                                               This Due Period       Amount
<S>                                                                                            <C>              <C>  
      (a) Group One                                                                              $80,595,713.85             $0.00

      (b) Group Two                                                                              $13,787,758.20             $0.00

      (c) Series 1996-3                                                                           $3,405,158.46             $0.00

      (d) Class A                                                                                 $3,238,034.12             $0.00

          Class B                                                                                   $167,124.34             $0.00
</TABLE>

9.   Investor Losses This Due Period
<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                 Original Invested
                                                                                                          Total       Principal
<S>                                                                                                       <C>    <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1996-3                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>


<PAGE>   3
<TABLE>
<CAPTION>
10.  Reimbursement of Investor Losses This Due Period                                                               Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total       Principal
<S>                                                                                                      <C>      <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1996-3                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>


<TABLE>
<CAPTION>
11.  Aggregate Amount of Unreimbursed Investor Losses                                                              Per $1,000 of
                                                                                                                 Original Invested
                                                                                                          Total       Principal
<S>                                                                                                       <C>    <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1996-3                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                               <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1996-3                                                                                             $1,052,631.67

      (d) Class A                                                                                                   $1,000,000.00

          Class B                                                                                                      $52,631.67

</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                  As a Percentage
                                                                                                                     of Class A
                                                                                                          Total   Invested Amount
<S>                                                                                              <C>              <C>     

          Series 1996-3 Class B                                                                  $37,894,740.00            6.3158%
</TABLE>


14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                    Shared Amount  Class B Amount
<S>                                                                                                 <C>            <C>           
          Maximum Amount                                                                                  $0.00    $18,947,370.00

          Available Amount                                                                                $0.00    $18,947,370.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                            $0.00             $0.00
</TABLE>


<PAGE>   4
     15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               

          End of Due Period Master Trust Receivables Outstanding                                               $20,448,816,201.71
</TABLE>

<TABLE>
<CAPTION>
                                                                         Delinquent Amount   Percentage of Ending
          Payment Status                                                   Ending Balance   Receivables Outstanding
<S>                                                                      <C>                <C>  

          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                            Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1996-3 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the"Pooling & Servicing Agreement") and
the Series Supplement, dated as of February 21, 1996 (the "Series Supplement")
by and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1996-3 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<S>                                                                                                           <C>
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                                    $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                                       $73,002,895.33

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                                                 $9,442,871.33

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                                    $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                                         $0.00
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                                                 <C>    
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                                        $3,767,891.37

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                                   $487,374.00

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                                    $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                                         $0.00

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>


     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                        as Master Servicer


                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (M)


                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1996-4 Monthly Statement
                      Class A Certificate CUSIP #25466KBA6
                      Class B Certificate CUSIP #25466KBB4


Trust Distribution Date: May 15, 1998         Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of April 30, 1996 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
          Series  1996-4                                                        Total                Interest          Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 6.031250000%                            $5.026041667          $5.026041667      $0.000000000

             Class B      30 days at 6.206250000%                            $5.171875000          $5.171875000      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                           <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1996-4 Investor Interest                                                                       $1,052,632,000.00

      (e) Class A Investor Interest                                                                             $1,000,000,000.00

          Class B Investor Interest                                                                                $52,632,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                           Finance Charge          Principal              Yield
                                                                            Collections           Collections         Collections
<S>                                                                       <C>                 <C>                     <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                                   $275,244,468.65     $2,127,916,652.24             $0.00

          Seller                                                           $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1996-4 Allocations                                        $16,570,716.13       $128,108,306.64             $0.00

      (e) Class A Allocations                                              $15,748,272.50       $121,749,989.95             $0.00

          Class B Allocations                                                 $822,443.63         $6,358,316.69             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                         Deposits into the
                                                              SPFAs This            SPFA               Deposi Deficit    Investment
                                                             Due Period            Balance                Amount            Income
<S>                                                      <C>                       <C>                 <C>               <C>  
          Series 1996-4                                         $0.00               $0.00                  0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                     Total Payments
                                                                               Amount Paid           Deficit Amount    Through This
                                                                              This Due Period       This Due Period      Due Period
<S>                                                                           <C>                   <C>              <C>  
          Series 1996-4                                                             $0.00                 $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                               Deposits Into the
                                                                                                  SIFAs This
                                                                                                  Due Period          SIFA Balance
<S>                                                                                            <C>                    <C>  
          Series 1996-4                                                                           $5,298,247.79             $0.00
</TABLE>

7.   Pool Factors
                                                                
<TABLE>
<CAPTION>
                                                                                                                   This Due Period
<S>                                                                                                                    <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                       Cumulative
                                                                                                                Investor Charged-Off
                                                                                                This Due Period          Amount
<S>                                                                                             <C>             <C>  

      (a) Group One                                                                              $80,595,713.85             $0.00

      (b) Group Two                                                                              $13,787,758.20             $0.00

      (c) Series 1996-4                                                                           $5,682,227.63             $0.00

      (d) Class A                                                                                 $5,400,205.30             $0.00

          Class B                                                                                   $282,022.33             $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                     Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total        Principal
<S>                                                                                                      <C>      <C>  

      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1996-4                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>


<PAGE>   3
<TABLE>
<CAPTION>
10.  Reimbursement of Investor Losses This Due Period                                                               Per $1,000 of
                                                                                                                 Original Invested
                                                                                                          Total         Principal
<S>                                                                                                       <C>    <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1996-4                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

<TABLE>
<CAPTION>
11.  Aggregate Amount of Unreimbursed Investor Losses                                                               Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total           Principal
<S>                                                                                                       <C>     <C>  

      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1996-4                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                                <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1996-4                                                                                             $1,754,386.67

      (d) Class A                                                                                                   $1,666,666.67

          Class B                                                                                                      $87,720.00
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                   As a Percentage
                                                                                                                      of Class A
                                                                                                    Total           Invested Amount
<S>                                                                                             <C>                <C>     

          Series 1996-4 Class B                                                                 $115,789,520.00          11.5790%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                   Shared Amount  Class B Amount
<S>                                                                                                <C>            <C>           
          Maximum Amount                                                                                  $0.00   $63,157,920.00

          Available Amount                                                                                $0.00    $63,157,920.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                            $0.00            $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
          End of Due Period Master Trust Receivables Outstanding                                               $20,448,816,201.71
</TABLE>

<TABLE>
<CAPTION>
                                                                         Delinquent Amount         Percentage of Ending
          Payment Status                                                  Ending Balance          Receivables Outstanding
<S>                                                                      <C>                      <C>  

          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                            Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1996-4 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the "Pooling & Servicing Agreement") and
the Series Supplement, dated as of April 30, 1996 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1996-4 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:

<TABLE>
<CAPTION>
<S>                                                                                                            <C>
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                                    $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                                      $121,749,989.95

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                                                $15,748,272.50

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                                             $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                                    $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                                 $5,026,041.67
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                                                 <C>  
     9.  The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                                        $6,358,316.69

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                                   $822,443.63

     11a. The aggregate amount of Class B Principal Collections recharacterized as
          Series Yield Collections during the related Due Period is equal to                                                $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                                    $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                                   $272,206.12

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                          as Master Servicer

                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (N)


                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1997-1 Monthly Statement
                      Class A Certificate CUSIP #25466KBD0
                      Class B Certificate CUSIP #25466KBE8


Trust Distribution Date: May 15, 1998         Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of August 26, 1997 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
          Series  1997-1                                                         Total               Interest         Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 5.746250000%                            $4.788541667          $4.788541667      $0.000000000

             Class B      30 days at 5.926250000%                            $4.938541667          $4.938541667      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                            <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1997-1 Investor Interest                                                                         $789,474,000.00

      (e) Class A Investor Interest                                                                               $750,000,000.00

          Class B Investor Interest                                                                                $39,474,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                           Finance Charge        Principal                Yield
                                                                             Collections        Collections            Collections
<S>                                                                       <C>                 <C>                      <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                                   $275,244,468.65     $2,127,916,652.24             $0.00

          Seller                                                           $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1997-1 Allocations                                        $12,428,037.09        $96,081,229.98             $0.00

      (e) Class A Allocations                                              $11,818,819.59        $91,371,365.77             $0.00

          Class B Allocations                                                 $609,217.50         $4,709,864.21             $0.00
</TABLE>


<PAGE>   2

4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                          Deposits into the
                                                             SPFAs This             SPFA             Deposit Deficit     Investment
                                                             Due Period            Balance               Amount            Income
<S>                                                       <C>                       <C>              <C>                 <C>  
          Series 1997-1                                         $0.00               $0.00                  0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                      Total Payments
                                                                               Amount Paid          Deficit Amount     Through This
                                                                             This Due Period        This Due Period     Due Period
<S>                                                                          <C>                    <C>               <C>  

          Series 1997-1                                                           $0.00                  $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                               Deposits Into the
                                                                                                  SIFAs This
                                                                                                  Due Period            SIFA Balance
<S>                                                                                            <C>                      <C>

          Series 1997-1                                                                           $3,786,350.24             $0.00
</TABLE>

7.   Pool Factors
<TABLE>
<CAPTION>
                                                                                                                    This Due Period
<S>                                                                                                              <C>
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                       Cumulative
                                                                                                                        Investor
                                                                                                                       Charged-Off
                                                                                               This Due Period           Amount
<S>                                                                                            <C>              <C>  
      (a) Group One                                                                              $80,595,713.85           $0.00

      (b) Group Two                                                                              $13,787,758.20           $0.00

      (c) Series 1997-1                                                                           $4,261,670.72           $0.00

      (d) Class A                                                                                 $4,052,765.29           $0.00

          Class B                                                                                   $208,905.43           $0.00
</TABLE>

9.   Investor Losses This Due Period
<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                 Original Invested
                                                                                                          Total       Principal
<S>                                                                                                       <C>    <C>  

      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1997-1                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>


<PAGE>   3

10.  Reimbursement of Investor Losses This Due Period
<TABLE>
<CAPTION>
                                                                                                          Total       Principal
<S>                                                                                                       <C>     7<C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1997-1                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

11.  Aggregate Amount of Unreimbursed Investor Losses
<TABLE>
<CAPTION>
                                                                                                          Total      Principal
<S>                                                                                                       <C>    <C>  

      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1997-1                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                               <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1997-1                                                                                             $1,315,790.00

      (d) Class A                                                                                                   $1,250,000.00

          Class B                                                                                                      $65,790.00
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period
<TABLE>
<CAPTION>
                                                                                                                  As a Percentage
                                                                                                                    of Class A
                                                                                                     Total        Invested Amount
<S>                                                                                              <C>              <C>     
          Series 1997-1 Class B                                                                  $98,684,250.00       13.1579%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                    Shared Amount  Class B Amount
<S>                                                                                                 <C>            <C>           
          Maximum Amount                                                                                  $0.00    $59,210,550.00

          Available Amount                                                                                $0.00    $59,210,550.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                            $0.00             $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
          End of Due Period Master Trust Receivables Outstanding                                               $20,448,816,201.71
</TABLE>

<TABLE>
<CAPTION>
                                                                         Delinquent Amount         Percentage of Ending
          Payment Status                                                   Ending Balance         Receivables Outstanding
<S>                                                                      <C>                      <C>  
          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                                  Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1997-1 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the "Pooling & Servicing Agreement") and
the Series Supplement, dated as of August 26, 1997 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1997-1 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<S>                                                                                                            <C>
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                                    $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                                       $91,371,365.77

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                                                $11,818,819.59

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                                             $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                                    $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                                 $3,591,406.25
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                                                <C> 
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                                        $4,709,864.21

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                                   $609,217.50

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                                             $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                                    $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                                   $194,943.99

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                          as Master Servicer

                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (O)

                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1997-2 Monthly Statement
                      Class A Certificate CUSIP #25466KBF5
                      Class B Certificate CUSIP #25466KBG3


Trust Distribution Date: May 15, 1998         Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of October 15, 1997 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
          Series  1997-2                                                         Total               Interest         Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 6.792000000%                            $5.660000000          $5.660000000      $0.000000000

             Class B      30 days at 6.056250000%                            $5.046875000          $5.046875000      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                            <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1997-2 Investor Interest                                                                         $526,316,000.00

      (e) Class A Investor Interest                                                                               $500,000,000.00

          Class B Investor Interest                                                                                $26,316,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                           Finance Charge          Principal             Yield
                                                                            Collections           Collections         Collections
<S>                                                                       <C>                 <C>                     <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                                   $275,244,468.65     $2,127,916,652.24          $0.00

          Seller                                                           $29,364,283.73       $227,015,455.16          $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07          $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17          $0.00

      (d) Series 1997-2 Allocations                                         $8,315,818.94        $64,289,646.53          $0.00

      (e) Class A Allocations                                               $7,889,366.69        $60,992,741.58          $0.00

          Class B Allocations                                                 $426,452.25         $3,296,904.95          $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                         Deposits into the
                                                            SPFAs This             SPFA           Deposit Deficit      Investment
                                                            Due Period            Balance              Amount            Income
<S>                                                      <C>                       <C>               <C>                 <C> 
          Series 1997-2                                         $0.00               $0.00                0.00             $0.00
</TABLE>


5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                      Total Payments
                                           Amount Paid         PSA Index           Monthly         Deficit Amount      Through This
                                         This Due Period         Rate*       Amortization Rate*    This Due Period      Due Period
<S>                                      <C>                    <C>           <C>                     <C>                <C>  
          Class A                             $0.00                N/A                 N/A              $0.00             $0.00

          Class B                             $0.00                N/A                 N/A              $0.00             $0.00
</TABLE>

     *Rates are only applicable during the Class A Controlled Liquidation
     Period.

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                               Deposits Into the
                                                                                                  SIFAs This
                                                                                                  Due Period          SIFA Balance
<S>                                                                                            <C>                    <C>  
          Series 1997-2                                                                           $2,962,813.56            $0.00
</TABLE>

7.   Pool Factors
<TABLE>
<CAPTION>
                                                                                                                    This Due Period
<S>                                                                                                                 <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount
<TABLE>
<CAPTION>
                                                                                                                     Cumulative
                                                                                                              Investor Charged-Off
                                                                                       This Due Period                Amount
<S>                                                                                    <C>                           <C>  

      (a) Group One                                                                     $80,595,713.85               $0.00

      (b) Group Two                                                                     $13,787,758.20               $0.00

      (c) Series 1997-2                                                                  $2,851,559.08               $0.00

      (d) Class A                                                                        $2,705,325.28               $0.00

          Class B                                                                          $146,233.80               $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                 Per $1,000 of
                                                                                                              Original Invested
                                                                                                 Total             Principal
<S>                                                                                             <C>                <C>  
      (a) Group One                                                                              $0.00             $0.00

      (b) Group Two                                                                              $0.00             $0.00

      (c) Series 1997-2                                                                          $0.00             $0.00

      (d) Class A                                                                                $0.00             $0.00

          Class B                                                                                $0.00             $0.00
</TABLE>


<PAGE>   3
10.  Reimbursement of Investor Losses This Due Period 
<TABLE>
<CAPTION>
                                                                                                                 Per $1,000 of
                                                                                                              Original Invested
                                                                                                   Total          Principal
<S>                                                                                                <C>               <C>  
      (a) Group One                                                                                $0.00             $0.00

      (b) Group Two                                                                                $0.00             $0.00

      (c) Series 1997-2                                                                            $0.00             $0.00

      (d) Class A                                                                                  $0.00             $0.00

          Class B                                                                                  $0.00             $0.00
</TABLE>


11.  Aggregate Amount of Unreimbursed Investor Losses
<TABLE>
<CAPTION>
                                                                                                                 Per $1,000 of
                                                                                                              Original Invested
                                                                                                   Total           Principal
<S>                                                                                                <C>               <C>  
      (a) Group One                                                                                $0.00             $0.00

      (b) Group Two                                                                                $0.00             $0.00

      (c) Series 1997-2                                                                            $0.00             $0.00

      (d) Class A                                                                                  $0.00             $0.00

          Class B                                                                                  $0.00             $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                         <C>           
      (a) Group One                                                                                         $24,854,402.77

      (b) Group Two                                                                                          $4,250,000.00

      (c) Series 1997-2                                                                                        $877,193.33

      (d) Class A                                                                                              $833,333.33

          Class B                                                                                               $43,860.00
</TABLE>


13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>  
                                                                                                                 As a Percentage
                                                                                                                   of Class A
                                                                                               Total             Invested Amount
<S>                                                                                         <C>                      <C>     
          Series 1997-2 Class B                                                             $47,368,440.00           9.4737%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                              Shared Amount       Class B Amount
<S>                                                                                               <C>             <C>

          Maximum Amount                                                                          $0.00           $21,052,640.00

          Available Amount                                                                        $0.00           $21,052,640.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                    $0.00                    $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary
<TABLE>
<S>                                                                                                            <C>               
          End of Due Period Master Trust Receivables Outstanding                                               $20,448,816,201.71
</TABLE>

<TABLE>
<CAPTION>
                                                                         Delinquent Amount         Percentage of Ending
          Payment Status                                                  Ending Balance          Receivables Outstanding
<S>                                                                      <C>                      <C>  
          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                                 Vice President 


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1997-2 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the "Pooling & Servicing Agreement") and
the Series Supplement, dated as of October 15, 1997 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1997-2 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<S>                                                                                                           <C>  
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                                    $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                                       $60,992,741.58

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                                                 $7,889,366.69

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                                             $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                                    $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                                 $2,830,000.00
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                                               <C>   

     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                                        $3,296,904.95

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                                   $426,452.25

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                                             $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                                    $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                                   $132,813.56

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>


     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                          as Master Servicer

                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (P)

                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1997-3 Monthly Statement
                      Class A Certificate CUSIP #25466KBH1
                      Class B Certificate CUSIP #25466KBJ7


Trust Distribution Date: May 15, 1998         Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of October 23, 1997 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
          Series  1997-3                                                        Total                Interest         Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 5.786250000%                            $4.821875000          $4.821875000      $0.000000000

             Class B      30 days at 5.966250000%                            $4.971875000          $4.971875000      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                            <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1997-3 Investor Interest                                                                         $684,211,000.00

      (e) Class A Investor Interest                                                                               $650,000,000.00

          Class B Investor Interest                                                                                $34,211,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                           Finance Charge          Principal              Yield
                                                                            Collections           Collections         Collections
<S>                                                                       <C>                 <C>                     <C>  

      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                                   $275,244,468.65     $2,127,916,652.24             $0.00

          Seller                                                           $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1997-3 Allocations                                        $10,783,149.84        $83,364,596.60             $0.00

      (e) Class A Allocations                                              $10,234,854.08        $79,125,718.81             $0.00

          Class B Allocations                                                 $548,295.76         $4,238,877.79             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                         Deposits into the
                                                            SPFAs This             SPFA              Deposit Deficit    Investment
                                                            Due Period            Balance                 Amount          Income
<S>                                                      <C>                      <C>                 <C>               <C>  
          Series 1997-3                                        $0.00               $0.00                   0.00            $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                      Total Payments
                                                                                Amount Paid          Deficit Amount    Through This
                                                                              This Due Period       This Due Period     Due Period
<S>                                                                           <C>                   <C>               <C>  

          Series 1997-3                                                            $0.00                 $0.00             $0.00
</TABLE>


6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                               Deposits Into the
                                                                                                  SIFAs This
                                                                                                  Due Period          SIFA Balance
<S>                                                                                            <C>                    <C>  
          Series 1997-3                                                                          $3,304,311.57            $0.00
</TABLE>

7.   Pool Factors

<TABLE>
<CAPTION>
                                                                                                                  This Due Period
<S>                                                                                                               <C>       
          Class A                                                                                                    1.00000000

          Class B                                                                                                    1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                       Cumulative
                                                                                                                        Investor
                                                                                                                       Charged-Off
                                                                                                This Due Period          Amount
<S>                                                                                             <C>                    <C>  

      (a) Group One                                                                              $80,595,713.85           $0.00

      (b) Group Two                                                                              $13,787,758.20           $0.00

      (c) Series 1997-3                                                                           $3,697,626.06           $0.00

      (d) Class A                                                                                 $3,509,611.18           $0.00

          Class B                                                                                   $188,014.88           $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                     Per $1,000 of
                                                                                                                  Original Invested
                                                                                                      Total           Principal
<S>                                                                                                   <C>         <C>  

      (a) Group One                                                                                   $0.00             $0.00

      (b) Group Two                                                                                   $0.00             $0.00

      (c) Series 1997-3                                                                               $0.00             $0.00

      (d) Class A                                                                                     $0.00             $0.00

          Class B                                                                                     $0.00             $0.00
</TABLE>


<PAGE>   3
10.  Reimbursement of Investor Losses This Due Period Per
<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                 Original Invested
                                                                                                          Total       Principal
<S>                                                                                                       <C>    <C>  

      (a) Group One                                                                                       $0.00         $0.00

      (b) Group Two                                                                                       $0.00         $0.00

      (c) Series 1997-3                                                                                   $0.00         $0.00

      (d) Class A                                                                                         $0.00         $0.00

          Class B                                                                                         $0.00         $0.00
</TABLE>


11.  Aggregate Amount of Unreimbursed Investor Losses
<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total       Principal
<S>                                                                                                       <C>     <C>  

      (a) Group One                                                                                       $0.00         $0.00

      (b) Group Two                                                                                       $0.00         $0.00

      (c) Series 1997-3                                                                                   $0.00         $0.00

      (d) Class A                                                                                         $0.00         $0.00

          Class B                                                                                         $0.00         $0.00
</TABLE>


12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                                <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1997-3                                                                                             $1,140,351.66

      (d) Class A                                                                                                   $1,083,333.33

          Class B                                                                                                      $57,018.33
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                   As a Percentage
                                                                                                                      of Class A
                                                                                                    Total           Invested Amount
<S>                                                                                              <C>               <C>     
          Series 1997-3 Class B                                                                  $85,526,375.00        13.1579%
</TABLE>


14.  Total Available Credit Enhancement Amounts


<TABLE>
<CAPTION>
                                                                                                   Shared Amount    Class B Amount
<S>                                                                                                <C>              <C>           

          Maximum Amount                                                                               $0.00        $51,315,825.00

          Available Amount                                                                             $0.00        $51,315,825.00

          Amount of Drawings on Credit Enhancement
            for this Due Period                \                                                       $0.00                 $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
     End of Due Period Master Trust Receivables Outstanding                                                    $20,448,816,201.71
</TABLE>


<TABLE>
<CAPTION>
                                                                         Delinquent Amount         Percentage of Ending
          Payment Status                                                  Ending Balance          Receivables Outstanding
<S>                                                                      <C>                      <C>  
          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                                 Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1997-3 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the "Pooling & Servicing Agreement") and
the Series Supplement, dated as of October 23, 1997 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1997-3 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:

<TABLE>
<S>                                                                                                             <C>   
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                                    $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                                       $79,125,718.81

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                                                $10,234,854.08

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                                             $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                                    $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                                 $3,134,218.75
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                                                 <C> 
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                                        $4,238,877.79

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                                   $548,295.76

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                                             $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                                    $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                                   $170,092.82

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                        as Master Servicer


                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer

<PAGE>   1
                                                                     EXHIBIT (Q)

                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1997-4 Monthly Statement
                      Class A Certificate CUSIP #25466KBK4
                      Class B Certificate CUSIP #25466KBL2


Trust Distribution Date: May 15, 1998         Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of October 31, 1997 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
          Series  1997-4                                                          Total              Interest          Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 5.726250000%                            $4.771875000          $4.771875000      $0.000000000

             Class B      30 days at 5.906250000%                            $4.921875000          $4.921875000      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                            <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1997-4 Investor Interest                                                                         $789,474,000.00

      (e) Class A Investor Interest                                                                               $750,000,000.00

          Class B Investor Interest                                                                                $39,474,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                           Finance Charge          Principal              Yield
                                                                            Collections           Collections         Collections
<S>                                                                       <C>                 <C>                     <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                                   $275,244,468.65     $2,127,916,652.24             $0.00

          Seller                                                           $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1997-4 Allocations                                        $12,428,037.09        $96,081,229.98             $0.00

      (e) Class A Allocations                                              $11,818,819.59        $91,371,365.77             $0.00

          Class B Allocations                                                 $609,217.50         $4,709,864.21             $0.00
</TABLE>


<PAGE>   2

4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                         Deposits into the
                                                            SPFAs This              SPFA            Deposit Deficit    Investment
                                                            Due Period             Balance               Amount          Income
<S>                                                      <C>                       <C>                 <C>               <C> 
          Series 1997-4                                         $0.00               $0.00                  0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                    Total Payments
                                                                       Amount Paid           Deficit Amount          Through This
                                                                     This Due Period        This Due Period           Due Period
<S>                                                                  <C>                    <C>                   <C>  
          Series 1997-4                                                      $0.00                 $0.00                  $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                           Deposits Into the
                                                                                              SIFAs This
                                                                                              Due Period              SIFA Balance
<S>                                                                                        <C>                        <C>  

          Series 1997-4                                                                       $3,773,192.34                 $0.00
</TABLE>

7.   Pool Factors

<TABLE>
                                                                                                                   This Due Period
<S>                                                                                                                <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                     Cumulative
                                                                                                                Investor Charged-Off
                                                                                   This Due Period                     Amount
<S>                                                                                <C>                          <C>  

      (a) Group One                                                                 $80,595,713.85                      $0.00

      (b) Group Two                                                                 $13,787,758.20                      $0.00

      (c) Series 1997-4                                                              $4,261,670.72                      $0.00

      (d) Class A                                                                    $4,052,765.29                      $0.00

          Class B                                                                      $208,905.43                      $0.00
</TABLE>


9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                     Per $1,000 of
                                                                                                                  Original Invested
                                                                                                 Total                 Principal
<S>                                                                                             <C>               <C>  

      (a) Group One                                                                              $0.00                   $0.00

      (b) Group Two                                                                              $0.00                   $0.00

      (c) Series 1997-4                                                                          $0.00                   $0.00

      (d) Class A                                                                                $0.00                   $0.00

          Class B                                                                                $0.00                   $0.00
</TABLE>


<PAGE>   3
10.  Reimbursement of Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                 Original Invested
                                                                                            Total                    Principal
<S>                                                                                         <C>                  <C>  

      (a) Group One                                                                         $0.00                      $0.00

      (b) Group Two                                                                         $0.00                      $0.00

      (c) Series 1997-4                                                                     $0.00                      $0.00

      (d) Class A                                                                           $0.00                      $0.00

          Class B                                                                           $0.00                      $0.00
</TABLE>

11.  Aggregate Amount of Unreimbursed Investor Losses

<TABLE>
<CAPTION>
                                                                                                                    Per $1,000 of
                                                                                                                  Original Invested
                                                                                            Total                     Principal
<S>                                                                                         <C>               <C>  

      (a) Group One                                                                         $0.00                       $0.00

      (b) Group Two                                                                         $0.00                       $0.00

      (c) Series 1997-4                                                                     $0.00                       $0.00

      (d) Class A                                                                           $0.00                       $0.00

          Class B                                                                           $0.00                       $0.00
</TABLE>


12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                               <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1997-4                                                                                             $1,315,790.00

      (d) Class A                                                                                                   $1,250,000.00

          Class B                                                                                                      $65,790.00
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                   As a Percentage
                                                                                                                     of Class A
                                                                                            Total                  Invested Amount
<S>                                                                                     <C>                        <C>     
          Series 1997-4 Class B                                                         $98,684,250.00                13.1579%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                        Shared Amount             Class B Amount
<S>                                                                                     <C>                       <C>           

          Maximum Amount                                                                    $0.00                  $59,210,550.00

          Available Amount                                                                  $0.00                  $59,210,550.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                              $0.00                           $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
          End of Due Period Master Trust Receivables Outstanding                                               $20,448,816,201.71
</TABLE>

<TABLE>
<CAPTION>
                                                                         Delinquent Amount         Percentage of Ending
          Payment Status                                                  Ending Balance          Receivables Outstanding
<S>                                                                      <C>                      <C>  


          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>



                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                                 Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1997-4 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the "Pooling & Servicing Agreement") and
the Series Supplement, dated as of October 31, 1997 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1997-4 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<CAPTION>
<S>                                                                                                            <C> 
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                                    $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                                       $91,371,365.77

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                                                $11,818,819.59

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                                        $0.00 
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                                    $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                                 $3,578,906.25
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                                                <C> 
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                                        $4,709,864.21

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                                   $609,217.50

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                                    $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                                   $194,286.09

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                      GREENWOOD TRUST COMPANY
                                      as Master Servicer

                                      By:____________________________________
                                         Vice President, Director of Accounting,
                                         and Treasurer
 


<PAGE>   1
                                                                     EXHIBIT (R)

                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1998-1 Monthly Statement
                      Class A Certificate CUSIP #25466KBM0
                      Class B Certificate CUSIP #25466KBN8


Trust Distribution Date: May 15, 1998        Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of January 14, 1998 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
          Series  1998-1                                                         Total               Interest          Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 5.746250000%                            $4.788541667          $4.788541667      $0.000000000

             Class B      30 days at 5.926250000%                            $4.938541667          $4.938541667      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                            <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1998-1 Investor Interest                                                                         $368,422,000.00

      (e) Class A Investor Interest                                                                               $350,000,000.00

          Class B Investor Interest                                                                                $18,422,000.00
</TABLE>

     3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                           Finance Charge          Principal              Yield
                                                                            Collections           Collections         Collections
<S>                                                                       <C>                 <C>                     <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation.                                  $275,244,468.65     $2,127,916,652.24             $0.00

          Seller:                                                          $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1998-1 Allocations                                         $5,818,027.17        $44,979,203.25             $0.00

      (e) Class A Allocations                                               $5,513,418.42        $42,624,271.14             $0.00

          Class B Allocations                                                 $304,608.75         $2,354,932.11             $0.00
</TABLE>

<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                         Deposits into the
                                                              SPFAs This            SPFA               Deposi Deficit    Investment
                                                             Due Period            Balance                Amount            Income
<S>                                                      <C>                       <C>                 <C>               <C>  

          Series 1998-1                                         $0.00               $0.00                  0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                     Total Payments
                                                                               Amount Paid           Deficit Amount    Through This
                                                                              This Due Period       This Due Period      Due Period
<S>                                                                           <C>                   <C>              <C>  

          Series 1998-1                                                             $0.00                 $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                               Deposits Into the
                                                                                                  SIFAs This
                                                                                                   DuePeriod          SIFA Balance
<S>                                                                                            <C>                    <C>  
          Series 1998-1                                                                           $1,766,967.39             $0.00
</TABLE>

7.   Pool Factors

<TABLE>
<CAPTION>
                                                                                                                 This Due Period
<S>                                                                                                              <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                       Cumulative
                                                                                                                Investor Charged-Off
                                                                                                This Due Period             Amount
<S>                                                                                             <C>             <C>  

      (a) Group One                                                                              $80,595,713.85             $0.00

      (b) Group Two                                                                              $13,787,758.20             $0.00

      (c) Series 1998-1                                                                           $1,995,046.83             $0.00

      (d) Class A                                                                                 $1,890,594.12             $0.00

          Class B                                                                                   $104,452.71             $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                     Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total        Principal
<S>                                                                                                      <C>      <C>  

      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1998-1                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>


<PAGE>   3
<TABLE>
<CAPTION>
10.  Reimbursement of Investor Losses This Due Period                                                               Per $1,000 of
                                                                                                                 Original Invested
                                                                                                          Total         Principal
<S>                                                                                                       <C>    <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1998-1                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

<TABLE>
<CAPTION>
11.  Aggregate Amount of Unreimbursed Investor Losses                                                               Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total           Principal
<S>                                                                                                       <C>     <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1998-1                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                                <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1998-1                                                                                               $614,036.66

      (d) Class A                                                                                                     $583,333.33

          Class B                                                                                                      $30,703.33
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                   As a Percentage
                                                                                                                      of Class A
                                                                                                    Total           Invested Amount
<S>                                                                                             <C>                <C>     

          Series 1998-1 Class B                                                                  $46,052,750.00       13.1579%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                   Shared Amount  Class B Amount
<S>                                                                                                <C>            <C>           

          Maximum Amount                                                                                  $0.00    $27,631,650.00

          Available Amount                                                                                $0.00    $27,631,650.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                            $0.00             $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
     End of Due Period Master Trust Receivables Outstanding                                                    $20,448,816,201.71
</TABLE>

<TABLE>
<CAPTION>
                                                                         Delinquent Amount         Percentage of Ending
          Payment Status                                                  Ending Balance          Receivables Outstanding
<S>                                                                      <C>                     <C>  


          30-59 days                                                      $578,496,902.86                 2.83%

          60-179 days                                                     $890,849,726.42                 4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                            Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1998-1 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the"Pooling & Servicing Agreement") and
the Series Supplement, dated as of January 14, 1998 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1998-1 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<S>                                                                                                            <C>   
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                                    $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                                       $42,624,271.14

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                                                 $5,513,418.42

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                                        $0.00 
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                                    $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                                 $1,675,989.58
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                                                 <C>
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                                        $2,354,932.11

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                                   $304,608.75

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                                    $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                                    $90,977.81

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>


     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                        as Master Servicer

                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (S)

                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1998-2 Monthly Statement
                      Class A Certificate CUSIP #25466KBP3
                      Class B Certificate CUSIP #25466KBQ1


Trust Distribution Date: May 15, 1998         Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of March 4, 1998 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)


<TABLE>
<CAPTION>
          Series  1998-2                                                         Total               Interest         Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 5.800000000%                            $4.833333333          $4.833333333      $0.000000000

             Class B      30 days at 5.950000000%                            $4.958333333          $4.958333333      $0.000000000
</TABLE>

     2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                            <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1998-2 Investor Interest                                                                         $526,316,000.00

      (e) Class A Investor Interest                                                                               $500,000,000.00

          Class B Investor Interest                                                                                $26,316,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                           Finance Charge          Principal              Yield
                                                                            Collections           Collections         Collections
<S>                                                                       <C>                 <C>                     <C>  

      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation.                                  $275,244,468.65     $2,127,916,652.24             $0.00

          Seller:                                                          $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1998-2 Allocations                                         $8,315,818.94        $64,289,646.53             $0.00

      (e) Class A Allocations                                               $7,889,366.69        $60,992,741.58             $0.00

          Class B Allocations                                                 $426,452.25         $3,296,904.95             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                         Deposits into the
                                                              SPFAs This            SPFA               Deposi Deficit    Investment
                                                             Due Period            Balance                Amount            Income
<S>                                                      <C>                       <C>                 <C>               <C> 

          Series 1998-2                                         $0.00               $0.00                  0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                    Total Payments
                                                                              Amount Paid           Deficit Amount     Through This
                                                                            This Due Period        This Due Period      Due Period
<S>                                                                         <C>                    <C>              <C>  

          Series 1998-2                                                             $0.00                 $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                               Deposits Into the
                                                                                                  SIFAs This
                                                                                                  Due Period          SIFA Balance
<S>                                                                                            <C>                  <C>  

          Series 1998-2                                                                           $2,547,150.17     $6,028,255.40
</TABLE>

7.   Pool Factors

<TABLE>
<CAPTION>
                                                                                                                  This Due Period
<S>                                                                                                               <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                       Cumulative
                                                                                                                Investor Charged-Off
                                                                                                This Due Period             Amount
<S>                                                                                             <C>             <C>  

      (a) Group One                                                                              $80,595,713.85             $0.00

      (b) Group Two                                                                              $13,787,758.20             $0.00

      (c) Series 1998-2                                                                           $2,851,559.08             $0.00

      (d) Class A                                                                                 $2,705,325.28             $0.00

          Class B                                                                                   $146,233.80             $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                     Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total        Principal
<S>                                                                                                       <C>     <C>  

      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1998-2                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>


<PAGE>   3
<TABLE>
<CAPTION>
10.  Reimbursement of Investor Losses This Due Period                                                               Per $1,000 of
                                                                                                                 Original Invested
                                                                                                          Total         Principal
<S>                                                                                                       <C>    <C>  

      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1998-2                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

<TABLE>
<CAPTION>
11.  Aggregate Amount of Unreimbursed Investor Losses                                                               Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total           Principal
<S>                                                                                                       <C>     <C>  

      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1998-2                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                                <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1998-2                                                                                               $877,193.33

      (d) Class A                                                                                                     $833,333.33

          Class B                                                                                                      $43,860.00
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                   As a Percentage
                                                                                                                      of Class A
                                                                                                    Total           Invested Amount
<S>                                                                                              <C>               <C>     
          Series 1998-2 Class B                                                                  $44,736,860.00        8.9474%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                   Shared Amount  Class B Amount
<S>                                                                                                <C>            <C>           

          Maximum Amount                                                                                  $0.00    $21,052,640.00

          Available Amount                                                                                $0.00    $21,052,640.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                            $0.00             $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
     End of Due Period Master Trust Receivables Outstanding                                                    $20,448,816,201.71
</TABLE>

<TABLE>
<CAPTION>
                                                                         Delinquent Amount         Percentage of Ending
          Payment Status                                                  Ending Balance          Receivables Outstanding
<S>                                                                      <C>                      <C>  
          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                            Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1998-2 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the"Pooling & Servicing Agreement") and
the Series Supplement, dated as of March 4, 1998 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1998-2 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:


<TABLE>
<S>                                                                                                            <C>  
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                                    $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                                       $60,992,741.58

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                                                 $7,889,366.69

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                                    $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                                         $0.00
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                                                 <C>   
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                                        $3,296,904.95

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                                   $426,452.25

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                                                $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                                  $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                                        $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                                  $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                                    $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                                         $0.00

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                        as Master Servicer


                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (T)

                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1998-3 Monthly Statement
                      Class A Certificate CUSIP #25466KBR9
                      Class B Certificate CUSIP #25466KBS7


Trust Distribution Date: May 15, 1998         Due Period Ending:  April 30, 1998

Pursuant to the Series Supplement dated as of March 25, 1998 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
          Series  1998-3                                                        Total                Interest          Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      30 days at 5.781250000%                            $4.817708333          $4.817708333      $0.000000000

             Class B      30 days at 5.946250000%                            $4.955208333          $4.955208333      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                            <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80

          Total Master Trust                                                                                   $20,126,913,509.80


      (b) Group One Investor Interest                                                                          $14,850,141,676.00

      (c) Group Two Investor Interest                                                                           $2,550,000,000.00

      (d) Series 1998-3 Investor Interest                                                                         $789,474,000.00

      (e) Class A Investor Interest                                                                               $750,000,000.00

          Class B Investor Interest                                                                                $39,474,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                           Finance Charge          Principal              Yield
                                                                            Collections           Collections         Collections
<S>                                                                       <C>                 <C>                     <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation.                                  $275,244,468.65     $2,127,916,652.24             $0.00
 
          Seller:                                                          $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1998-3 Allocations                                        $12,428,037.09        $96,081,229.98             $0.00

      (e) Class A Allocations                                              $11,818,819.59        $91,371,365.77             $0.00

          Class B Allocations                                                 $609,217.50         $4,709,864.21             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                         Deposits into the
                                                              SPFAs This            SPFA           Deposit Deficit    Investment
                                                             Due Period            Balance             Amount           Income
<S>                                                      <C>                       <C>              <C>                 <C>  
          Series 1998-3                                         $0.00               $0.00               0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                     Total Payments
                                                                               Amount Paid           Deficit Amount    Through This
                                                                              This Due Period       This Due Period      Due Period
<S>                                                                           <C>                   <C>              <C>  
          Series 1998-3                                                             $0.00                 $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                      Deposits Into the
                                                                                         SIFAs This
                                                                                         Due Period            SIFA Balance
<S>                                                                                   <C>                       <C>  
          Series 1998-3                                                                  $3,808,883.14             $0.00
</TABLE>

7.   Pool Factors


<TABLE>
<CAPTION>
                                                                                                              This Due Period
<S>                                                                                                              <C>       
          Class A                                                                                                1.00000000

          Class B                                                                                                1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                 Cumulative
                                                                                                           Investor Charged-Off
                                                                                   This Due Period                 Amount
<S>                                                                                <C>                             <C>  

      (a) Group One                                                                 $80,595,713.85                 $0.00

      (b) Group Two                                                                 $13,787,758.20                 $0.00

      (c) Series 1998-3                                                              $4,261,670.72                 $0.00

      (d) Class A                                                                    $4,052,765.29                 $0.00

          Class B                                                                      $208,905.43                 $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                 Per $1,000 of
                                                                                                              Original Invested
                                                                                                   Total           Principal
<S>                                                                                                <C>               <C>  

      (a) Group One                                                                                $0.00             $0.00

      (b) Group Two                                                                                $0.00             $0.00

      (c) Series 1998-3                                                                            $0.00             $0.00

      (d) Class A                                                                                  $0.00             $0.00

          Class B                                                                                  $0.00             $0.00
</TABLE>


<PAGE>   3
<TABLE>
<CAPTION>
10.  Reimbursement of Investor Losses This Due Period                                                               Per $1,000 of
                                                                                                                 Original Invested
                                                                                                          Total         Principal
<S>                                                                                                       <C>    <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1998-3                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

<TABLE>
<CAPTION>
11.  Aggregate Amount of Unreimbursed Investor Losses                                                               Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total           Principal
<S>                                                                                                       <C>     <C>  

      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1998-3                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                                <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                $4,250,000.00

      (c) Series 1998-3                                                                                            $1,315,790.00

      (d) Class A                                                                                                  $1,250,000.00

          Class B                                                                                                     $65,790.00
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                   As a Percentage
                                                                                                                      of Class A
                                                                                                    Total           Invested Amount
<S>                                                                                             <C>                <C>     

          Series 1998-3 Class B                                                                  $98,684,250.00        13.1579%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                   Shared Amount  Class B Amount
<S>                                                                                                <C>            <C>           
          Maximum Amount                                                                                  $0.00    $59,210,550.00

          Available Amount                                                                                $0.00    $59,210,550.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                            $0.00             $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
          End of Due Period Master Trust Receivables Outstanding                                               $20,448,816,201.71
</TABLE>

<TABLE>
<CAPTION>
                                                                         Delinquent Amount         Percentage of Ending
          Payment Status                                                  Ending Balance          Receivables Outstanding
<S>                                                                      <C>                      <C>  
          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                            Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1998-3 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the"Pooling & Servicing Agreement") and
the Series Supplement, dated as of March 25, 1998 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1998-3 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:

<TABLE>
<CAPTION>
<S>                                                                                           <C>
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                  $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                     $91,371,365.77

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                              $11,818,819.59

     6a.  The aggregate amount of Class A Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal to                           $0.00

     6b.  The aggregate amount of Class A Additional Funds for this Distribution
          date is equal to                                                                                $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                      $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                  $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                               $3,613,281.25
</TABLE>


<PAGE>   6
<TABLE>
<CAPTION>
<S>                                                                                           <C>
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                      $4,709,864.21

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                 $609,217.50

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                              $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                      $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                  $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                 $195,601.89

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.


                                        GREENWOOD TRUST COMPANY
                                        as Master Servicer

                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



<PAGE>   1
                                                                     EXHIBIT (U)

                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1998-4 Monthly Statement
                      Class A Certificate CUSIP #25466KBT5
                      Class B Certificate CUSIP #25466KBU2


Trust Distribution Date: May 15, 1998          Due Period Ending: April 30, 1998

Pursuant to the Series Supplement dated as of April 9, 1998 relating to the
Pooling and Servicing Agreement dated as of October 1, 1993 by and between
Greenwood Trust Company and U.S. Bank National Association, as Trustee, the
Trustee is required to prepare certain information each month regarding current
distributions to Certificateholders and the performances of the Trust. The
information for the Due Period and the Trust Distribution Date listed above is
set forth below:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     Class Initial Investor Interest)

<TABLE>
<CAPTION>
          Series  1998-4                                                        Total                Interest          Principal
<S>                                                                          <C>                   <C>               <C>         
             Class A      36 days at 5.750000000%                            $5.750000000          $5.750000000      $0.000000000

             Class B      36 days at 5.900000000%                            $5.900000000          $5.900000000      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                                                           <C>               
      (a) Aggregate Investor Interest                                                                          $17,400,141,676.00
          Seller Interest                                                                                       $2,726,771,833.80
                                                                                                              
          Total Master Trust                                                                                   $20,126,913,509.80
                                                                                                              
                                                                                                              
      (b) Group One Investor Interest                                                                          $14,850,141,676.00
                                                                                                              
      (c) Group Two Investor Interest                                                                           $2,550,000,000.00
                                                                                                              
      (d) Series 1998-4 Investor Interest                                                                         $526,316,000.00
                                                                                                              
      (e) Class A Investor Interest                                                                               $500,000,000.00
                                                                                                              
          Class B Investor Interest                                                                                $26,316,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period

<TABLE>
<CAPTION>
                                                                           Finance Charge          Principal              Yield
                                                                            Collections           Collections         Collections
<S>                                                                       <C>                 <C>                     <C>  
      (a) Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation.                                  $275,244,468.65     $2,127,916,652.24             $0.00

          Seller:                                                          $29,364,283.73       $227,015,455.16             $0.00

      (b) Group One Allocation                                            $235,036,113.32     $1,817,065,614.07             $0.00

      (c) Group Two Allocation                                             $40,208,355.33       $310,851,038.17             $0.00

      (d) Series 1998-4 Allocations                                         $8,315,818.94        $64,289,646.53             $0.00

      (e) Class A Allocations                                               $7,889,366.69        $60,992,741.58             $0.00

          Class B Allocations                                                 $426,452.25         $3,296,904.95             $0.00
</TABLE>


<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")

<TABLE>
<CAPTION>
                                                         Deposits into the
                                                              SPFAs This            SPFA               Deposi Deficit    Investment
                                                             Due Period            Balance                Amount            Income
<S>                                                      <C>                       <C>                 <C>               <C>  
          Series 1998-4                                         $0.00               $0.00                  0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments

<TABLE>
<CAPTION>
                                                                                                                     Total Payments
                                                                               Amount Paid           Deficit Amount    Through This
                                                                              This Due Period       This Due Period      Due Period
<S>                                                                           <C>                   <C>              <C>  
          Series 1998-4                                                             $0.00                 $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")

<TABLE>
<CAPTION>
                                                                                               Deposits Into the
                                                                                                  SIFAs This
                                                                                                   DuePeriod          SIFA Balance
<S>                                                                                            <C>                    <C>  
          Series 1998-4                                                                           $3,030,264.40       $3,030,264.40
</TABLE>

7.   Pool Factors

<TABLE>
<CAPTION>
                                                                                                                    This Due Period
 

<S>                                                                                                                    <C>       
          Class A                                                                                                      1.00000000

          Class B                                                                                                      1.00000000
</TABLE>

8.   Investor Charged-Off Amount

<TABLE>
<CAPTION>
                                                                                                                       Cumulative
                                                                                                                Investor Charged-Off
                                                                                                This Due Period          Amount
<S>                                                                                              <C>            <C>  

      (a) Group One                                                                              $80,595,713.85             $0.00

      (b) Group Two                                                                              $13,787,758.20             $0.00

      (c) Series 1998-4                                                                           $2,851,559.08             $0.00

      (d) Class A                                                                                 $2,705,325.28             $0.00

          Class B                                                                                   $146,233.80             $0.00
</TABLE>

9.   Investor Losses This Due Period

<TABLE>
<CAPTION>
                                                                                                                     Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total        Principal
<S>                                                                                                      <C>      <C>  

      (a) Group One                                                                                       $0.00             $0.00
                                                                                                                        
      (b) Group Two                                                                                       $0.00             $0.00
                                                                                                                        
      (c) Series 1998-4                                                                                   $0.00             $0.00
                                                                                                                        
      (d) Class A                                                                                         $0.00             $0.00
                                                                                                                        
          Class B                                                                                         $0.00             $0.00
</TABLE>


<PAGE>   3
<TABLE>
<CAPTION>
10.  Reimbursement of Investor Losses This Due Period                                                               Per $1,000 of
                                                                                                                 Original Invested
                                                                                                          Total         Principal
<S>                                                                                                       <C>    <C>  
      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1998-4                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

<TABLE>
<CAPTION>
11.  Aggregate Amount of Unreimbursed Investor Losses                                                               Per $1,000 of
                                                                                                                  Original Invested
                                                                                                          Total           Principal
<S>                                                                                                       <C>     <C>  

      (a) Group One                                                                                       $0.00             $0.00

      (b) Group Two                                                                                       $0.00             $0.00

      (c) Series 1998-4                                                                                   $0.00             $0.00

      (d) Class A                                                                                         $0.00             $0.00

          Class B                                                                                         $0.00             $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period

<TABLE>
<S>                                                                                                                <C>           
      (a) Group One                                                                                                $24,854,402.77

      (b) Group Two                                                                                                 $4,250,000.00

      (c) Series 1998-4                                                                                               $877,193.33

      (d) Class A                                                                                                     $833,333.33

          Class B                                                                                                      $43,860.00
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period

<TABLE>
<CAPTION>
                                                                                                                   As a Percentage
                                                                                                                      of Class A
                                                                                                    Total           Invested Amount
<S>                                                                                             <C>                <C>     

          Series 1998-4 Class B                                                                  $44,736,860.00           8.9474%
</TABLE>

14.  Total Available Credit Enhancement Amounts

<TABLE>
<CAPTION>
                                                                                                   Shared Amount  Class B Amount
<S>                                                                                                <C>            <C>           

          Maximum Amount                                                                                  $0.00    $21,052,640.00

          Available Amount                                                                                $0.00    $21,052,640.00

          Amount of Drawings on Credit Enhancement
           for this Due Period                                                                            $0.00             $0.00
</TABLE>


<PAGE>   4
15.  Delinquency Summary

<TABLE>
<S>                                                                                                            <C>               
          End of Due Period Master Trust Receivables Outstanding                                               $20,448,816,201.71
</TABLE>

<TABLE>
<CAPTION>
                                                                         Delinquent Amount         Percentage of Ending
          Payment Status                                                  Ending Balance          Receivables Outstanding
<S>                                                                      <C>                      <C>  

          30-59 days                                                      $578,496,902.86                  2.83%

          60-179 days                                                     $890,849,726.42                  4.36%
</TABLE>


                                        U.S. BANK NATIONAL ASSOCIATION
                                        as Trustee


                                        BY: __________________________
                                        Vice President


<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1998-4 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

     The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the"Pooling & Servicing Agreement") and
the Series Supplement, dated as of April 9, 1998 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1998-4 Master Trust Certificates for the Distribution Date
occurring on May 15, 1998:

<TABLE>
<CAPTION>
<S>                                                                                                            <C>
     1.   Greenwood is Master Servicer under the Pooling and Servicing
          Agreement.

     2.   The undersigned is a Servicing Officer of Greenwood as Master
          Servicer.

     3.   The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                  $2,659,540,859.87

     4.   The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                     $60,992,741.58

     5.   The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                               $7,889,366.69

     6a.  The aggregate amount of Class A Principal Collections
          recharacterized as Series Yield Collections during the related Due
          Period is equal to                                                                              $0.00

     6b.  The aggregate amount of Class A Additional Funds for this
          Distribution date is equal to                                                                   $0.00

     7.   The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class A Required Amount Shortfall                                      $0.00
               is equal to

          (b)  with respect to the Class A Cumulative Investor Charged-Off                                $0.00
               Amount is equal to

          (c)  with respect to the Class A Investor Interest is equal to                                  $0.00

     8.   The sum of all amounts payable to the Class A Certificateholders on
          the current Distribution Date is equal to                                                       $0.00
</TABLE>


<PAGE>   6
<TABLE>
<CAPTION>
<S>                                                                                                            <C>
     9.   The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                      $3,296,904.95

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                 $426,452.25

     11a. The aggregate amount of Class B Principal Collections recharacterized
          as Series Yield Collections during the related Due Period is equal
          to                                                                                              $0.00

     11b. The aggregate amount of Class B Additional Funds for this Distribution
          date is equal to                                                                                $0.00

     12.  The amount of drawings under the Credit Enhancement required to be
          made on the related Drawing Date pursuant to the Series Supplement:

          (a)  with respect to the Class B Required Amount Shortfall                                      $0.00
               is equal to

          (b)  with respect to the Class B Cumulative Investor Charged-Off                                $0.00
               Amount is equal to

          (c)  with respect to the Class B Investor Interest is equal to                                  $0.00

     13.  The sum of all amounts payable to the Class B Certificateholders on
          the current Distribution Date is equal to                                                       $0.00

     14.  Attached hereto is a true copy of the statement required to be
          delivered by the Master Servicer on the date of this Certificate to
          the Trustee pursuant to Section 16 of the Series Supplement.
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of May, 1998.



                                        GREENWOOD TRUST COMPANY
                                        as Master Servicer

                                        By:____________________________________
                                        Vice President, Director of Accounting,
                                        and Treasurer



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