DISCOVER CARD MASTER TRUST I
424B3, 1998-08-11
ASSET-BACKED SECURITIES
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<PAGE>   1
PROSPECTUS SUPPLEMENT                          This Prospectus Supplement, filed
FOR THE PERIOD ENDING                          pursuant to Rule 424(b)(3),      
JULY 31, 1998 TO                               relates to Registration Statement
PROSPECTUS DATED                               33-54804-01 and the Prospectus   
OCTOBER 19, 1993                               dated October 19, 1993           



                       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): August 17, 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 140
                         Index to Exhibits is on page 7


<PAGE>   2
Item 5.  Other Events

A) Series 1993-1:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1993-1, which is
attached as Exhibit 20(a) hereto.

B) Series 1993-2:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1993-2, which is
attached as Exhibit 20(b) hereto.

C) Series 1993-3:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1993-3, which is
attached as Exhibit 20(c) hereto.

D) Series 1994-2:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1994-2, which is
attached as Exhibit 20(d) hereto.

E) Series 1994-3:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1994-3, which is
attached as Exhibit 20(e) hereto.

F) Series 1994-A:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1994-A, which is
attached as Exhibit 20(f) hereto.

G) Series 1995-1:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1995-1, which is
attached as Exhibit 20(g) hereto.

H) Series 1995-2:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1995-2, which is
attached as Exhibit 20(h) hereto.

I) Series 1995-3:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1995-3, which is
attached as Exhibit 20(i) hereto.

J) Series 1996-1:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1996-1, which is
attached as Exhibit 20(j) hereto.

K) Series 1996-2:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1996-2, which is
attached as Exhibit 20(k) hereto.


                                       2
<PAGE>   3
L) Series 1996-3:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1996-3, which is
attached as Exhibit 20(l) hereto.

M) Series 1996-4:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1996-4, which is
attached as Exhibit 20(m) hereto.

N) Series 1997-1:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1997-1, which is
attached as Exhibit 20(n) hereto.

O) Series 1997-2:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1997-2, which is
attached as Exhibit 20(o) hereto.

P) Series 1997-3:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1997-3, which is
attached as Exhibit 20(p) hereto.

Q) Series 1997-4:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1997-4, which is
attached as Exhibit 20(q) hereto.

R) Series 1998-1:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1998-1, which is
attached as Exhibit 20(r) hereto.

S) Series 1998-2:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1998-2, which is
attached as Exhibit 20(s) hereto.

T) Series 1998-3:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1998-3, which is
attached as Exhibit 20(t) hereto.

U) Series 1998-4:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1998-4, which is
attached as Exhibit 20(u) hereto.

V) Series 1998-6:
On August 17, 1998 the Registrant made available the Monthly Certificateholders'
Statement for the July 1998 Due Period with respect to Series 1998-6, which is
attached as Exhibit 20(v) hereto.


                                       3
<PAGE>   4
Item 7.  Financial Statements and Exhibits
(c) Exhibits

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

20(a)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1993-1.

20(b)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1993-2.

20(c)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1993-3.

20(d)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1994-2.

20(e)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1994-3.

20(f)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1994-A.

20(g)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1995-1.

20(h)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1995-2.

20(i)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1995-3.

20(j)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1996-1.

20(k)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1996-2.

20(l)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1996-3.

20(m)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1996-4.

20(n)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1997-1.


                                       4
<PAGE>   5
20(o)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1997-2.

20(p)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1997-3.

20(q)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1997-4.

20(r)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1998-1.

20(s)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1998-2.

20(t)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1998-3.

20(u)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1998-4.

20(v)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1998-6.


                                       5
<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, Chief Accounting
                                 Officer and Treasurer


Date: August 17, 1998


                                       6
<PAGE>   7
                                  EXHIBIT INDEX

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

20(a)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1993-1.

20(b)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1993-2.

20(c)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1993-3.

20(d)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1994-2.

20(e)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1994-3.

20(f)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1994-A.

20(g)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1995-1.

20(h)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1995-2.

20(i)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1995-3.

20(j)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1996-1.

20(k)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1996-2.

20(l)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1996-3.

20(m)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1996-4.

20(n)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1997-1.

20(o)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1997-2.


                                       7
<PAGE>   8
20(p)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1997-3.

20(q)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1997-4.

20(r)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1998-1.

20(s)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1998-2.

20(t)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1998-3.

20(u)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1998-4.

20(v)          Monthly Certificateholders' Statement, related to the Due Period
               ending July 31, 1998, for Series 1998-6.


                                       8

<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: August 17, 1998 Due Period Ending: July 31, 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:

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

       Series  1993-1                                        Total          Interest           Principal
<S>                           <C>                         <C>              <C>                <C>          
              Class A         33 days at 5.926250000%     $87.407630208    $4.074296875       $83.333333333

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


<TABLE>
<CAPTION>
2.     Principal Receivables at the end of the Due Period
<S>                                                                                      <C>               
       (a) Aggregate Investor Interest                                                   $18,246,305,675.99
           Seller Interest                                                                $5,100,331,762.00

           Total Master Trust                                                            $23,346,637,437.99


       (b) Group One Investor Interest                                                   $15,696,305,675.99

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

       (d) Series 1993-1 Investor Interest                                                  $547,873,000.00

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

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


<TABLE>
<CAPTION>
3.     Allocation of Receivables Collected During the Due Period

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

           Aggregate Investor Allocation                $296,997,296.09         $2,774,730,011.35     $0.00

           Seller                                        $38,441,258.33           $359,141,697.88     $0.00

       (b) Group One Allocation                         $255,771,897.76         $2,389,577,178.28     $0.00

       (c) Group Two Allocation                          $41,225,398.33           $385,152,833.07     $0.00

       (d) Series 1993-1 Allocations                      $9,861,893.50            $92,135,828.25     $0.00

       (e) Class A Allocations                            $9,090,384.83            $84,927,923.32     $0.00

           Class B Allocations                              $771,508.67             $7,207,904.93     $0.00
</TABLE>



<PAGE>   2

<TABLE>
<CAPTION>
4.     Information Concerning the Series Principal Funding Accounts ("SPFA")

                                    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>


<TABLE>
<CAPTION>
5.     Information Concerning Amount of Controlled Liquidation Payments
                                                                                            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                     $250,000,000.00
</TABLE>


<TABLE>
<CAPTION>
6.     Information Concerning the Series Interest Funding Accounts ("SIFA")

                                   Deposits Into the
                                      SIFAs This
                                       Due Period                         SIFA Balance

<S>                                <C>                                    <C>  
       Series 1993-1                    $3,267,161.74                             $0.00
</TABLE>


<TABLE>
<CAPTION>
7.     Pool Factors
                                                                                            This Due Period

<S>                                                                                         <C>       
       Class A                                                                                   0.66666667

       Class B                                                                                   1.00000000
</TABLE>


<TABLE>
<CAPTION>
8.     Investor Charged-Off Amount
                                                                                           Cumulative
                                                                                       Investor Charged-Off
                                                        This Due Period                       Amount
<S>                                                     <C>                            <C>  
       (a)Group One                                     $100,561,910.37                               $0.00

       (b)Group Two                                      $16,208,601.69                               $0.00

       (c)Series 1993-1                                   $3,877,403.50                               $0.00

       (d)Class A                                         $3,574,069.21                               $0.00

          Class B                                           $303,334.29                               $0.00
</TABLE>


<TABLE>
<CAPTION>
9.     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 1993-1                                           $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 1993-1                                           $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 1993-1                                           $0.00                               $0.00

       (d)Class A                                                 $0.00                               $0.00

          Class B                                                 $0.00                               $0.00
</TABLE>


<TABLE>
<CAPTION>
12.    Investor Monthly Servicing Fee Payable at the end of the Due Period
<S>                                                                                          <C>           
       (a)Group One                                                                          $26,375,787.22

       (b)Group Two                                                                           $4,250,000.00

       (c)Series 1993-1                                                                       $1,017,288.33

       (d)Class A                                                                               $937,500.00

          Class B                                                                                $79,788.33
</TABLE>


<TABLE>
<CAPTION>
13.    Class Available Subordinated Amount at the end of the Due Period
                                                                                            As a Percentage
                                                                                              of Class A
                                                                  Total                     Invested Amount
<S>                                                      <C>                                <C>     
       Series 1993-1 Class B                             $63,829,840.00                             12.7660%
</TABLE>


<TABLE>
<CAPTION>
14.    Total Available Credit Enhancement Amounts
                                                          Shared Amount                      Class B Amount
<S>                                                      <C>                                 <C>           
       Maximum Amount                                    $13,696,825.00                      $15,957,460.00

       Available Amount                                  $13,696,825.00                      $15,957,460.00

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



<PAGE>   4

<TABLE>
<CAPTION>
15.    Delinquency Summary

       End of Due Period Master Trust Receivables Outstanding  $23,730,662,810.60

                                    Delinquent Amount            Percentage of Ending
       Payment Status               Ending Balance              Receivables Outstanding
<S>                                 <C>                         <C>  
       30-59 days                     $630,971,468.44           2.66%

       60-179 days                  $1,084,269,351.39           4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                         $84,927,923.32

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                               $9,090,384.83

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                                                  $65,555,722.66
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $7,207,904.93

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $771,508.67

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998 Due Period Ending: July 31, 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:

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

       Series  1993-2                                        Total          Interest           Principal
<S>                           <C>                         <C>              <C>                <C>          
              Class A         30 days at 5.400000000%     $87.083333337    $3.750000000       $83.333333338

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


<TABLE>
<CAPTION>
2.     Principal Receivables at the end of the Due Period
<S>                                                                                      <C>               
       (a)Aggregate Investor Interest                                                    $18,246,305,675.99
          Seller Interest                                                                 $5,100,331,762.00

          Total Master Trust                                                             $23,346,637,437.99


       (b)Group One Investor Interest                                                    $15,696,305,675.99

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

       (d)Series 1993-2 Investor Interest                                                   $633,333,999.99

       (e)Class A Investor Interest                                                         $599,999,999.99

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


<TABLE>
<CAPTION>
3.     Allocation of Receivables Collected During the Due Period

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

          Aggregate Investor Allocation                 $296,997,296.09         $2,774,730,011.35     $0.00

          Seller                                         $38,441,258.33           $359,141,697.88     $0.00

       (b)Group One Allocation                          $255,771,897.76         $2,389,577,178.28     $0.00

       (c)Group Two Allocation                           $41,225,398.33           $385,152,833.07     $0.00

       (d)Series 1993-2 Allocations                      $11,304,279.28           $105,611,476.60     $0.00

       (e)Class A Allocations                            $10,767,577.59           $100,597,281.87     $0.00

          Class B Allocations                               $536,701.69             $5,014,194.73     $0.00
</TABLE>



<PAGE>   2

<TABLE>
<CAPTION>
4.     Information Concerning the Series Principal Funding Accounts ("SPFA")

                                    Deposits into the
                                        SPFAs This               SPFA   Deposit Deficit          Investment
                                        Due Period              Balance     Amount                 Income

<S>                                 <C>                         <C>     <C>                      <C>  
       Series 1993-2                   $66,666,666.67             $0.00            0.00               $0.00
</TABLE>


<TABLE>
<CAPTION>
5.     Information Concerning Amount of Controlled Liquidation Payments
                                                                                             Total Payments
                                        Amount Paid      Deficit Amount                       Through This
                                      This Due Period   This Due Period                        Due Period
<S>                                   <C>               <C>                                 <C>
       Series 1993-2                   $66,666,666.67             $0.00                     $200,000,000.01
</TABLE>


<TABLE>
<CAPTION>
6.     Information Concerning the Series Interest Funding Accounts ("SIFA")

                                                      Deposits Into the
                                                         SIFAs This
                                                         Due Period                            SIFA Balance
<S>                                                   <C>                                      <C>  
       Series 1993-2                                      $3,159,725.42                               $0.00
</TABLE>


<TABLE>
<CAPTION>
7.     Pool Factors                                                                         This Due Period
<S>                                                                                         <C>       
       Class A                                                                                   0.75000000

       Class B                                                                                   1.00000000
</TABLE>


<TABLE>
<CAPTION>
8.     Investor Charged-Off Amount
                                                                                           Cumulative
                                                                                       Investor Charged-Off
                                                        This Due Period                       Amount
<S>                                                     <C>                            <C>  
       (a)Group One                                     $100,561,910.37                               $0.00

       (b)Group Two                                      $16,208,601.69                               $0.00

       (c)Series 1993-2                                   $4,444,506.73                               $0.00

       (d)Class A                                         $4,233,491.57                               $0.00

          Class B                                           $211,015.16                               $0.00
</TABLE>


<TABLE>
<CAPTION>
9.     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 1993-2                                           $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 1993-2                                           $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 1993-2                                           $0.00                               $0.00

       (d)Class A                                                 $0.00                               $0.00

          Class B                                                 $0.00                               $0.00
</TABLE>


<TABLE>
<CAPTION>
12.    Investor Monthly Servicing Fee Payable at the end of the Due Period
<S>                                                                                          <C>           
       (a)Group One                                                                          $26,375,787.22

       (b)Group Two                                                                           $4,250,000.00

       (c)Series 1993-2                                                                       $1,166,667.78

       (d)Class A                                                                             $1,111,111.11

          Class B                                                                                $55,556.67
</TABLE>


<TABLE>
<CAPTION>
13.    Class Available Subordinated Amount at the end of the Due Period
                                                                                            As a Percentage
                                                                                              of Class A
                                                                  Total                     Invested Amount
<S>                                                      <C>                                <C>     
       Series 1993-2 Class B                             $50,000,040.00                              8.3333%
</TABLE>


<TABLE>
<CAPTION>
14.    Total Available Credit Enhancement Amounts
                                                          Shared Amount                      Class B Amount
<S>                                                      <C>                                 <C>           
       Maximum Amount                                    $16,666,680.00                       $8,333,340.00

       Available Amount                                  $16,666,680.00                       $8,333,340.00

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



<PAGE>   4

<TABLE>
<CAPTION>
15.    Delinquency Summary

       End of Due Period Master Trust Receivables Outstanding  $23,730,662,810.60

                                    Delinquent Amount            Percentage of Ending
       Payment Status               Ending Balance              Receivables Outstanding
<S>                                 <C>                         <C>  
       30-59 days                     $630,971,468.44           2.66%

       60-179 days                  $1,084,269,351.39           4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                        $100,597,281.87

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                              $10,767,577.59

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                                                  $69,666,666.67
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $5,014,194.73

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $536,701.69

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 17th day of August, 1998.


                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998 Due Period Ending: July 31, 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:

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

       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>


<TABLE>
<CAPTION>
2.     Principal Receivables at the end of the Due Period
<S>                                                                                      <C>               
       (a)Aggregate Investor Interest                                                    $18,246,305,675.99
          Seller Interest                                                                 $5,100,331,762.00

          Total Master Trust                                                             $23,346,637,437.99


       (b)Group One Investor Interest                                                    $15,696,305,675.99

       (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>


<TABLE>
<CAPTION>
3.     Allocation of Receivables Collected During the Due Period

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

          Aggregate Investor Allocation                 $296,997,296.09         $2,774,730,011.35     $0.00

          Seller                                         $38,441,258.33           $359,141,697.88     $0.00

       (b)Group One Allocation                          $255,771,897.76         $2,389,577,178.28     $0.00

       (c)Group Two Allocation                           $41,225,398.33           $385,152,833.07     $0.00

       (d)Series 1993-3 Allocations                       $5,937,262.42            $55,469,529.26     $0.00

       (e)Class A Allocations                             $5,668,911.57            $52,962,431.89     $0.00

          Class B Allocations                               $268,350.85             $2,507,097.37     $0.00
</TABLE>



<PAGE>   2

<TABLE>
<CAPTION>
4.     Information Concerning the Series Principal Funding Accounts ("SPFA")

                                    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>


<TABLE>
<CAPTION>
5.     Information Concerning Amount of Controlled Liquidation Payments
                                                                                             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>


<TABLE>
<CAPTION>
6.     Information Concerning the Series Interest Funding Accounts ("SIFA")

                                                      Deposits Into the
                                                         SIFAs This
                                                          Due Period                           SIFA Balance
<S>                                                   <C>                                      <C>  
       Series 1993-3                                      $1,896,983.21                       $5,690,949.63
</TABLE>


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

       Class B                                                                                   1.00000000
</TABLE>


<TABLE>
<CAPTION>
8.     Investor Charged-Off Amount
                                                                                           Cumulative
                                                                                       Investor Charged-Off
                                                        This Due Period                       Amount
<S>                                                     <C>                            <C>  
       (a)Group One                                     $100,561,910.37                               $0.00

       (b)Group Two                                      $16,208,601.69                               $0.00

       (c)Series 1993-3                                   $2,334,355.17                               $0.00

       (d)Class A                                         $2,228,847.59                               $0.00

          Class B                                           $105,507.58                               $0.00
</TABLE>


<TABLE>
<CAPTION>
9.     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 1993-3                                           $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 1993-3                                           $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 1993-3                                           $0.00                               $0.00

       (d)Class A                                                 $0.00                               $0.00

          Class B                                                 $0.00                               $0.00
</TABLE>


<TABLE>
<CAPTION>
12.    Investor Monthly Servicing Fee Payable at the end of the Due Period
<S>                                                                                          <C>           
       (a)Group One                                                                          $26,375,787.22

       (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>


<TABLE>
<CAPTION>
13.    Class Available Subordinated Amount at the end of the Due Period
                                                                                            As a Percentage
                                                                                              of Class A
                                                                  Total                     Invested Amount
<S>                                                      <C>                                <C>     
       Series 1993-3 Class B                             $23,822,045.00                              6.8063%
</TABLE>


<TABLE>
<CAPTION>
14.    Total Available Credit Enhancement Amounts
                                                          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

<TABLE>
<CAPTION>
15.    Delinquency Summary

       End of Due Period Master Trust Receivables Outstanding  $23,730,662,810.60

                                    Delinquent Amount            Percentage of Ending
       Payment Status               Ending Balance              Receivables Outstanding
<S>                                 <C>                         <C>  
       30-59 days                     $630,971,468.44                              2.66%

       60-179 days                  $1,084,269,351.39                              4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                         $52,962,431.89

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                               $5,668,911.57

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                                                          $2,507,097.37

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $268,350.85

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998 Due Period Ending: July 31, 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:

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

       Series  1994-2                                        Total          Interest           Principal
<S>                           <C>                         <C>              <C>                <C>          
       Class A                33 days at 6.006250000%      $5.505729167    $5.505729167        $0.000000000

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


<TABLE>
<CAPTION>
2.     Principal Receivables at the end of the Due Period
<S>                                                                                      <C>               
       (a)Aggregate Investor Interest                                                    $18,246,305,675.99
          Seller Interest                                                                 $5,100,331,762.00

          Total Master Trust                                                             $23,346,637,437.99


       (b)Group One Investor Interest                                                    $15,696,305,675.99

       (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>


<TABLE>
<CAPTION>
3.     Allocation of Receivables Collected During the Due Period

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

          Aggregate Investor Allocation                 $296,997,296.09         $2,774,730,011.35     $0.00

          Seller                                         $38,441,258.33           $359,141,697.88     $0.00

       (b)Group One Allocation                          $255,771,897.76         $2,389,577,178.28     $0.00

       (c)Group Two Allocation                           $41,225,398.33           $385,152,833.07     $0.00

       (d)Series 1994-2 Allocations                      $14,457,401.70           $135,069,870.67     $0.00

       (e)Class A Allocations                            $13,719,436.88           $128,175,352.91     $0.00

          Class B Allocations                               $737,964.82             $6,894,517.76     $0.00
</TABLE>



<PAGE>   2

<TABLE>
<CAPTION>
4.     Information Concerning the Series Principal Funding Accounts ("SPFA")

                                    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>


<TABLE>
<CAPTION>
5.     Information Concerning Amount of Controlled Liquidation Payments
                                                                                             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>


<TABLE>
<CAPTION>
6.     Information Concerning the Series Interest Funding Accounts ("SIFA")

                                                      Deposits Into the
                                                         SIFAs This
                                                          Due Period                           SIFA Balance
<S>                                                   <C>                                      <C>  
       Series 1994-2                                      $4,979,980.50                               $0.00
</TABLE>


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

       Class B                                                                                   1.00000000
</TABLE>


<TABLE>
<CAPTION>
8.     Investor Charged-Off Amount
                                                                                           Cumulative
                                                                                       Investor Charged-Off
                                                        This Due Period                       Amount
<S>                                                     <C>                            <C>  
       (a)Group One                                     $100,561,910.37                               $0.00

       (b)Group Two                                      $16,208,601.69                               $0.00

       (c)Series 1994-2                                   $5,684,220.77                               $0.00

       (d)Class A                                         $5,394,074.93                               $0.00

          Class B                                           $290,145.84                               $0.00
</TABLE>


<TABLE>
<CAPTION>
9.     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 1994-2                                           $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 1994-2                                           $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 1994-2                                           $0.00                               $0.00

       (d)Class A                                                 $0.00                               $0.00

          Class B                                                 $0.00                               $0.00
</TABLE>


<TABLE>
<CAPTION>
12.    Investor Monthly Servicing Fee Payable at the end of the Due Period
<S>                                                                                          <C>           
       (a)Group One                                                                          $26,375,787.22

       (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>


<TABLE>
<CAPTION>
13.    Class Available Subordinated Amount at the end of the Due Period
                                                                                            As a Percentage
                                                                                              of Class A
                                                                  Total                     Invested Amount
<S>                                                      <C>                                <C>     
       Series 1994-2 Class B                             $89,473,700.00                             10.5263%
</TABLE>


<TABLE>
<CAPTION>
14.    Total Available Credit Enhancement Amounts
                                                          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

<TABLE>
<CAPTION>
15.    Delinquency Summary

       End of Due Period Master Trust Receivables Outstanding  $23,730,662,810.60

                                    Delinquent Amount            Percentage of Ending
       Payment Status               Ending Balance              Receivables Outstanding
<S>                                 <C>                         <C>  
       30-59 days                     $630,971,468.44                              2.66%

       60-179 days                  $1,084,269,351.39                              4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                        $128,175,352.91

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                              $13,719,436.88

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                                                   $4,679,869.79
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $6,894,517.76

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $737,964.82

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                                      
            is equal to                                                                               $0.00

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

      (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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998   Due Period Ending: July 31, 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:

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

       Series  1994-3                                        Total          Interest           Principal
<S>                           <C>                         <C>              <C>                <C>          
              Class A         33 days at 5.846250000%      $5.359062500    $5.359062500        $0.000000000

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


<TABLE>
<CAPTION>
2.     Principal Receivables at the end of the Due Period
<S>                                                                                      <C>               
       (a)Aggregate Investor Interest                                                    $18,246,305,675.99
          Seller Interest                                                                 $5,100,331,762.00

          Total Master Trust                                                             $23,346,637,437.99


       (b)Group One Investor Interest                                                    $15,696,305,675.99

       (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>


<TABLE>
<CAPTION>
3.     Allocation of Receivables Collected During the Due Period
                                                         Finance Charge             Principal        Yield
                                                          Collections              Collections     Collections
<S>                                                     <C>                     <C>                <C>  
       (a)Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                 $296,997,296.09         $2,774,730,011.35     $0.00

          Seller                                         $38,441,258.33           $359,141,697.88     $0.00

       (b)Group One Allocation                          $255,771,897.76         $2,389,577,178.28     $0.00

       (c)Group Two Allocation                           $41,225,398.33           $385,152,833.07     $0.00

       (d)Series 1994-3 Allocations                      $12,746,665.07           $119,087,124.95     $0.00

       (e)Class A Allocations                            $12,109,331.81           $113,132,768.70     $0.00

          Class B Allocations                               $637,333.26             $5,954,356.25     $0.00
</TABLE>



<PAGE>   2

<TABLE>
<CAPTION>
4.     Information Concerning the Series Principal Funding Accounts ("SPFA")
                                    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>


<TABLE>
<CAPTION>
5.     Information Concerning Amount of Controlled Liquidation Payments
                                                                                             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>


<TABLE>
<CAPTION>
6.     Information Concerning the Series Interest Funding Accounts ("SIFA")
                                                      Deposits Into the
                                                         SIFAs This
                                                         Due Period                            SIFA Balance
<S>                                                   <C>                                      <C>  
       Series 1994-3                                      $4,274,233.13                               $0.00
</TABLE>


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

       Class B                                                                                   1.00000000
</TABLE>


<TABLE>
<CAPTION>
8.     Investor Charged-Off Amount
                                                                                           Cumulative
                                                                                       Investor Charged-Off
                                                        This Due Period                       Amount
<S>                                                     <C>                            <C>  
       (a)Group One                                     $100,561,910.37                               $0.00

       (b)Group Two                                      $16,208,601.69                               $0.00

       (c)Series 1994-3                                   $5,011,609.96                               $0.00

       (d)Class A                                         $4,761,029.46                               $0.00

          Class B                                           $250,580.50                               $0.00
</TABLE>


<TABLE>
<CAPTION>
9.     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 1994-3                                           $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 1994-3                                           $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 1994-3                                           $0.00                               $0.00

       (d)Class A                                                 $0.00                               $0.00

          Class B                                                 $0.00                               $0.00
</TABLE>


<TABLE>
<CAPTION>
12.    Investor Monthly Servicing Fee Payable at the end of the Due Period
<S>                                                                                          <C>           
       (a)Group One                                                                          $26,375,787.22

       (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>


<TABLE>
<CAPTION>
13.    Class Available Subordinated Amount at the end of the Due Period
                                                                                            As a Percentage
                                                                                              of Class A
                                                                  Total                     Invested Amount
<S>                                                      <C>                                <C>     
          Series 1994-3 Class B                   $83,131,612.20    11.0842%
</TABLE>


<TABLE>
<CAPTION>
14.    Total Available Credit Enhancement Amounts
                                                          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

<TABLE>
<CAPTION>
15.    Delinquency Summary

       End of Due Period Master Trust Receivables  
         Outstanding                                             $23,730,662,810.60

                                    Delinquent Amount            Percentage of Ending
       Payment Status               Ending Balance              Receivables Outstanding
<S>                                 <C>                                  <C>  
       30-59 days                     $630,971,468.44                     2.66%

       60-179 days                  $1,084,269,351.39                     4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                        $113,132,768.70

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                              $12,109,331.81

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                                                   $4,019,296.88
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $5,954,356.25

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $637,333.26

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                and Treasurer



<PAGE>   1

                                                                     EXHIBIT (F)

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


Trust Distribution Date: August 17, 1998   Due Period Ending: July 31, 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:

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

       Series  1994-A                                        Total          Interest           Principal
<S>                           <C>                         <C>              <C>                <C>          
              Class A         30 days at 5.940311600%      $4.950259667    $4.950259667        $0.000000000
</TABLE>


<TABLE>
<CAPTION>
2.     Principal Receivables at the end of the Due Period
<S>                                                                                      <C>               
       (a)Aggregate Investor Interest                                                    $18,246,305,675.99
          Seller Interest                                                                 $5,100,331,762.00

          Total Master Trust                                                             $23,346,637,437.99


       (b)Group One Investor Interest                                                    $15,696,305,675.99

       (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>


<TABLE>
<CAPTION>
3.     Allocation of Receivables Collected During the Due Period
                                                         Finance Charge             Principal        Yield
                                                          Collections              Collections     Collections
<S>                                                     <C>                     <C>                <C>  
       (a)Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                 $296,997,296.09         $2,774,730,011.35     $0.00

          Seller                                         $38,441,258.33           $359,141,697.88     $0.00

       (b)Group One Allocation                          $255,771,897.76         $2,389,577,178.28     $0.00

       (c)Group Two Allocation                           $41,225,398.33           $385,152,833.07     $0.00

       (d)Series 1994-A Allocations                      $41,225,398.33           $385,152,833.07     $0.00

       (e)Class A Allocations                            $41,225,398.33           $385,152,833.07     $0.00

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



<PAGE>   2

<TABLE>
<CAPTION>
4.     Information Concerning the Series Principal Funding Accounts ("SPFA")

                                    Deposits into the
                                        SPFAs This               SPFA   Deposit Deficit          Investment
                                        Due Period              Balance     Amount                 Income

<S>                                 <C>                         <C>     <C>                      <C>  
       Series 1994-A                            $0.00             $0.00            0.00               $0.00
</TABLE>


<TABLE>
<CAPTION>
5.     Information Concerning Amount of Controlled Liquidation Payments
                                                                                             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>


<TABLE>
<CAPTION>
6.     Information Concerning the Series Interest Funding Accounts ("SIFA")

                                                      Deposits Into the
                                                         SIFAs This
                                                         Due Period                            SIFA Balance
<S>                                                   <C>                                      <C>  
       Series 1994-A                                     $12,623,162.15                               $0.00
</TABLE>


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

       Class B                                                                                   0.00000000
</TABLE>


<TABLE>
<CAPTION>
8.     Investor Charged-Off Amount
                                                                                           Cumulative
                                                                                       Investor Charged-Off
                                                        This Due Period                       Amount
<S>                                                     <C>                            <C>  
       (a)Group One                                     $100,561,910.37                               $0.00

       (b)Group Two                                      $16,208,601.69                               $0.00

       (c)Series 1994-A                                  $16,208,601.69                               $0.00

       (d)Class A                                        $16,208,601.69                               $0.00

          Class B                                                 $0.00                               $0.00
</TABLE>


<TABLE>
<CAPTION>
9.     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>



<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>


<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 1994-A                                           $0.00                               $0.00

       (d)Class A                                                 $0.00                               $0.00

          Class B                                                 $0.00                               $0.00
</TABLE>


<TABLE>
<CAPTION>
12.    Investor Monthly Servicing Fee Payable at the end of the Due Period
<S>                                                                                          <C>           
       (a)Group One                                                                          $26,375,787.22

       (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>


<TABLE>
<CAPTION>
13.    Class Available Subordinated Amount at the end of the Due Period
                                                                                            As a Percentage
                                                                                              of Class A
                                                                  Total                     Invested Amount
<S>                                                      <C>                                <C>     
       Series 1994-A Class B                                      $0.00                              0.0000%
</TABLE>


<TABLE>
<CAPTION>
14.    Total Available Credit Enhancement Amounts
                                                          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

<TABLE>
<CAPTION>
15.    Delinquency Summary

       End of Due Period Master Trust Receivables Outstanding  $23,730,662,810.60

                                    Delinquent Amount            Percentage of Ending
       Payment Status               Ending Balance              Receivables Outstanding
<S>                                 <C>                         <C>  
       30-59 days                     $630,971,468.44                    2.66%

       60-179 days                  $1,084,269,351.39                    4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                        $385,152,833.07

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                              $41,225,398.33

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                                                  $12,623,162.15

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998 Due Period Ending: July 31, 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:

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

       Series  1995-1-A                                        Total          Interest           Principal
<S>                           <C>                         <C>              <C>                <C>          
              Class A         33 days at 5.936250000%      $5.441562500    $5.441562500        $0.000000000

              Class B         33 days at 6.106250000%      $5.597395833    $5.597395833        $0.000000000
</TABLE>


<TABLE>
<CAPTION>
2.     Principal Receivables at the end of the Due Period
<S>                                                                                      <C>               
       (a)Aggregate Investor Interest                                                    $18,246,305,675.99
          Seller Interest                                                                 $5,100,331,762.00

          Total Master Trust                                                             $23,346,637,437.99


       (b)Group One Investor Interest                                                    $15,696,305,675.99

       (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>


<TABLE>
<CAPTION>
3.     Allocation of Receivables Collected During the Due Period

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

          Aggregate Investor Allocation                 $296,997,296.09         $2,774,730,011.35     $0.00

          Seller                                         $38,441,258.33           $359,141,697.88     $0.00

       (b)Group One Allocation                          $255,771,897.76         $2,389,577,178.28     $0.00

       (c)Group Two Allocation                           $41,225,398.33           $385,152,833.07     $0.00

       (d)Series 1995-1 Allocations                      $10,197,332.05            $95,269,699.96     $0.00

       (e)Class A Allocations                             $9,694,174.22            $90,568,892.40     $0.00

          Class B Allocations                               $503,157.83             $4,700,807.56     $0.00
</TABLE>



<PAGE>   2

<TABLE>
<CAPTION>
4.     Information Concerning the Series Principal Funding Accounts ("SPFA")

                                    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>


<TABLE>
<CAPTION>
5.     Information Concerning Amount of Controlled Liquidation Payments
                                                                                             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>


<TABLE>
<CAPTION>
6.     Information Concerning the Series Interest Funding Accounts ("SIFA")

                                                      Deposits Into the
                                                         SIFAs This
                                                          Due Period                           SIFA Balance
<S>                                                   <C>                                      <C>  
       Series 1995-1                                      $3,441,697.66                               $0.00
</TABLE>


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

       Class B                                                                                   1.00000000
</TABLE>


<TABLE>
<CAPTION>
8.     Investor Charged-Off Amount
                                                                                           Cumulative
                                                                                       Investor Charged-Off
                                                        This Due Period                       Amount
<S>                                                     <C>                            <C>  
       (a)Group One                                     $100,561,910.37                               $0.00

       (b)Group Two                                      $16,208,601.69                               $0.00

       (c)Series 1995-1                                   $4,009,287.97                               $0.00

       (d)Class A                                         $3,811,461.26                               $0.00

          Class B                                           $197,826.71                               $0.00

</TABLE>


<TABLE>
<CAPTION>
9.     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>



<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>


<TABLE>
<CAPTION>
12.    Investor Monthly Servicing Fee Payable at the end of the Due Period
<S>                                                                                          <C>           
       (a)Group One                                            $26,375,787.22

       (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>


<TABLE>
<CAPTION>
13.    Class Available Subordinated Amount at the end of the Due Period
                                                                                            As a Percentage
                                                                                              of Class A
                                                                  Total                     Invested Amount
<S>                                                      <C>                                <C>     
       Series 1995-1 Class B                             $69,473,690.00                             11.5789%
</TABLE>


<TABLE>
<CAPTION>
14.    Total Available Credit Enhancement Amounts
                                                          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

<TABLE>
<CAPTION>
15.    Delinquency Summary

       End of Due Period Master Trust Receivables Outstanding  $23,730,662,810.60

                                    Delinquent Amount            Percentage of Ending
       Payment Status               Ending Balance              Receivables Outstanding
<S>                                 <C>                         <C>  
       30-59 days                     $630,971,468.44                   2.66%

       60-179 days                  $1,084,269,351.39                   4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                         $90,568,892.40

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                               $9,694,174.22

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                                                   $3,264,937.50
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $4,700,807.56

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $503,157.83

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                                                     $176,760.16

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998 Due Period Ending: July 31, 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:

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

       Series  1995-2                                        Total          Interest           Principal
<S>                           <C>                         <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>


<TABLE>
<CAPTION>
2.     Principal Receivables at the end of the Due Period
<S>                                                                                      <C>               
       (a)Aggregate Investor Interest                                                    $18,246,305,675.99
          Seller Interest                                                                 $5,100,331,762.00

          Total Master Trust                                                             $23,346,637,437.99


       (b)Group One Investor Interest                                                    $15,696,305,675.99

       (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>


<TABLE>
<CAPTION>
3.     Allocation of Receivables Collected During the Due Period

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

          Aggregate Investor Allocation                 $296,997,296.09         $2,774,730,011.35     $0.00

          Seller                                         $38,441,258.33           $359,141,697.88     $0.00

       (b)Group One Allocation                          $255,771,897.76         $2,389,577,178.28     $0.00

       (c)Group Two Allocation                           $41,225,398.33           $385,152,833.07     $0.00

       (d)Series 1995-2 Allocations                       $8,520,139.28            $79,600,341.41     $0.00

       (e)Class A Allocations                             $8,084,069.16            $75,526,308.19     $0.00

          Class B Allocations                               $436,070.12             $4,074,033.22     $0.00
</TABLE>



<PAGE>   2

<TABLE>
<CAPTION>
4.     Information Concerning the Series Principal Funding Accounts ("SPFA")

                                    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>


<TABLE>
<CAPTION>
5.     Information Concerning Amount of Controlled Liquidation Payments
                                                                                             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>


<TABLE>
<CAPTION>
6.     Information Concerning the Series Interest Funding Accounts ("SIFA")

                                                      Deposits Into the
                                                         SIFAs This
                                                         Due Period                            SIFA Balance
<S>                                                   <C>                                      <C>  
       Series 1995-2                                      $2,877,194.17                               $0.00
</TABLE>


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

       Class B                                                                                   1.00000000
</TABLE>


<TABLE>
<CAPTION>
8.     Investor Charged-Off Amount
                                                                                           Cumulative
                                                                                       Investor Charged-Off
                                                        This Due Period                       Amount
<S>                                                     <C>                            <C>  
       (a)Group One                                     $100,561,910.37                               $0.00

       (b)Group Two                                      $16,208,601.69                               $0.00

       (c)Series 1995-2                                   $3,349,865.60                               $0.00

       (d)Class A                                         $3,178,415.79                               $0.00

          Class B                                           $171,449.81                               $0.00
</TABLE>


<TABLE>
<CAPTION>
9.     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>



<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>


<TABLE>
<CAPTION>
12.    Investor Monthly Servicing Fee Payable at the end of the Due Period
<S>                                                                                          <C>           
       (a)Group One                                                                          $26,375,787.22

       (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>


<TABLE>
<CAPTION>
13.    Class Available Subordinated Amount at the end of the Due Period
                                                                                            As a Percentage
                                                                                              of Class A
                                                                  Total                     Invested Amount
<S>                                                      <C>                                <C>     
       Series 1995-2 Class B                             $34,210,540.00                              6.8421%
</TABLE>


<TABLE>
<CAPTION>
14.    Total Available Credit Enhancement Amounts
                                                          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

<TABLE>
<CAPTION>
15.    Delinquency Summary

       End of Due Period Master Trust Receivables Outstanding $23,730,662,810.60

                                    Delinquent Amount            Percentage of Ending
       Payment Status               Ending Balance              Receivables Outstanding
<S>                                 <C>                         <C>  
       30-59 days                     $630,971,468.44                  2.66%

       60-179 days                  $1,084,269,351.39                  4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                         $75,526,308.19

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                               $8,084,069.16

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                                                  $16,375,000.02
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $4,074,033.22

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $436,070.12

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                                                     $888,165.00

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998       Due Period Ending: July 31, 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:

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

       Series  1995-3                                        Total          Interest           Principal
<S>                           <C>                         <C>              <C>                <C>          
              Class A         33 days at 5.866250000%      $5.377395833    $5.377395833        $0.000000000

              Class B         33 days at 5.986250000%      $5.487395833    $5.487395833        $0.000000000
</TABLE>


<TABLE>
<CAPTION>
2.     Principal Receivables at the end of the Due Period
<S>                                                                                      <C>               
       (a)Aggregate Investor Interest                                                    $18,246,305,675.99
          Seller Interest                                                                 $5,100,331,762.00

          Total Master Trust                                                             $23,346,637,437.99


       (b)Group One Investor Interest                                                    $15,696,305,675.99

       (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>


<TABLE>
<CAPTION>
3.     Allocation of Receivables Collected During the Due Period
                                                         Finance Charge             Principal        Yield
                                                          Collections              Collections     Collections
<S>                                                     <C>                     <C>                <C>  
       (a)Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation.                $296,997,296.09         $2,774,730,011.35     $0.00

          Seller:                                        $38,441,258.33           $359,141,697.88     $0.00

       (b)Group One Allocation                          $255,771,897.76         $2,389,577,178.28     $0.00

       (c)Group Two Allocation                           $41,225,398.33           $385,152,833.07     $0.00

       (d)Series 1995-3 Allocations                       $8,520,139.28            $79,600,341.41     $0.00

       (e)Class A Allocations                             $8,084,069.16            $75,526,308.19     $0.00

          Class B Allocations                               $436,070.12             $4,074,033.22     $0.00
</TABLE>



<PAGE>   2

<TABLE>
<CAPTION>
4.     Information Concerning the Series Principal Funding Accounts ("SPFA")
                                    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>


<TABLE>
<CAPTION>
5.     Information Concerning Amount of Controlled Liquidation Payments
                                                                                             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>


<TABLE>
<CAPTION>
6.     Information Concerning the Series Interest Funding Accounts ("SIFA")
                                                      Deposits Into the
                                                         SIFAs This
                                                          Due Period                           SIFA Balance
<S>                                                   <C>                                      <C>  
       Series 1995-3                                      $2,833,104.23                               $0.00
</TABLE>


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

       Class B                                                                                   1.00000000
</TABLE>


<TABLE>
<CAPTION>
8.     Investor Charged-Off Amount
                                                                                           Cumulative
                                                                                       Investor Charged-Off
                                                        This Due Period                       Amount
<S>                                                     <C>                            <C>  
       (a)Group One                                     $100,561,910.37                               $0.00

       (b)Group Two                                      $16,208,601.69                               $0.00

       (c)Series 1995-3                                   $3,349,865.60                               $0.00

       (d)Class A                                         $3,178,415.79                               $0.00

          Class B                                           $171,449.81                               $0.00
</TABLE>


<TABLE>
<CAPTION>
9.     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 1995-3                                           $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 1995-3                                           $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 1995-3                                           $0.00                               $0.00

       (d)Class A                                                 $0.00                               $0.00

          Class B                                                 $0.00                               $0.00
</TABLE>


<TABLE>
<CAPTION>
12.    Investor Monthly Servicing Fee Payable at the end of the Due Period
<S>                                                                                          <C>           
       (a)Group One                                                                          $26,375,787.22

       (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>


<TABLE>
<CAPTION>
13.    Class Available Subordinated Amount at the end of the Due Period
                                                                                            As a Percentage
                                                                                              of Class A
                                                                  Total                     Invested Amount
<S>                                                      <C>                                <C>     
       Series 1995-3 Class B                             $57,894,760.00                             11.5790%
</TABLE>


<TABLE>
<CAPTION>
14.    Total Available Credit Enhancement Amounts
                                                          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

<TABLE>
<CAPTION>
15.    Delinquency Summary

       End of Due Period Master Trust Receivables Outstanding        $23,730,662,810.60

                                    Delinquent Amount            Percentage of Ending
       Payment Status               Ending Balance              Receivables Outstanding
<S>                                 <C>                         <C>  
       30-59 days                     $630,971,468.44                              2.66%

       60-179 days                  $1,084,269,351.39                              4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                         $75,526,308.19

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                               $8,084,069.16

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                                                   $2,688,697.92
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $4,074,033.22

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $436,070.12

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                                                     $144,406.31

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998 Due Period Ending: July 31, 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:

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

       Series  1996-1                                        Total          Interest           Principal
<S>                           <C>                         <C>              <C>                <C>          
              Class A         33 days at 5.826250000%      $5.340729167    $5.340729167        $0.000000000

              Class B         33 days at 5.956250000%      $5.459895833    $5.459895833        $0.000000000
</TABLE>


<TABLE>
<CAPTION>
2.     Principal Receivables at the end of the Due Period
<S>                                                                                      <C>               
       (a)Aggregate Investor Interest                                                    $18,246,305,675.99
          Seller Interest                                                                 $5,100,331,762.00

          Total Master Trust                                                             $23,346,637,437.99


       (b)Group One Investor Interest                                                    $15,696,305,675.99

       (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>


<TABLE>
<CAPTION>
3.     Allocation of Receivables Collected During the Due Period

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

          Aggregate Investor Allocation                 $296,997,296.09         $2,774,730,011.35     $0.00

          Seller                                         $38,441,258.33           $359,141,697.88     $0.00

       (b)Group One Allocation                          $255,771,897.76         $2,389,577,178.28     $0.00

       (c)Group Two Allocation                           $41,225,398.33           $385,152,833.07     $0.00

       (d)Series 1996-1 Allocations                      $17,006,734.71           $158,887,295.66     $0.00

       (e)Class A Allocations                            $16,168,138.33           $151,052,616.39     $0.00

          Class B Allocations                               $838,596.38             $7,834,679.27     $0.00
</TABLE>



<PAGE>   2

<TABLE>
<CAPTION>
4.     Information Concerning the Series Principal Funding Accounts ("SPFA")

                                    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>


<TABLE>
<CAPTION>
5.     Information Concerning Amount of Controlled Liquidation Payments
                                                                                             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>


<TABLE>
<CAPTION>
6.     Information Concerning the Series Interest Funding Accounts ("SIFA")

                                                      Deposits Into the
                                                         SIFAs This
                                                          Due Period                           SIFA Balance
<S>                                                   <C>                                      <C>  
        Series 1996-1                                     $5,628,094.41                               $0.00
</TABLE>


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

       Class B                                                                                   1.00000000
</TABLE>


<TABLE>
<CAPTION>
8.     Investor Charged-Off Amount
                                                                                           Cumulative
                                                                                       Investor Charged-Off
                                                        This Due Period                       Amount
<S>                                                     <C>                            <C>  
       (a)Group One                                     $100,561,910.37                               $0.00

       (b)Group Two                                      $16,208,601.69                               $0.00

       (c)Series 1996-1                                   $6,686,542.76                               $0.00

       (d)Class A                                         $6,356,831.58                               $0.00

          Class B                                           $329,711.18                               $0.00
</TABLE>


<TABLE>
<CAPTION>
9.     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 1996-1                                           $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 1996-1                                           $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 1996-1                                           $0.00                               $0.00

       (d)Class A                                                 $0.00                               $0.00

          Class B                                                 $0.00                               $0.00
</TABLE>


<TABLE>
<CAPTION>
12.    Investor Monthly Servicing Fee Payable at the end of the Due Period
<S>                                                                                          <C>           
       (a)Group One                                                                          $26,375,787.22

       (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>


<TABLE>
<CAPTION>
13.    Class Available Subordinated Amount at the end of the Due Period
                                                                                            As a Percentage
                                                                                              of Class A
                                                                  Total                     Invested Amount
<S>                                                      <C>                                <C>     
          Series 1996-1 Class B                         $105,263,200.00                            $10.5263%
</TABLE>


<TABLE>
<CAPTION>
14.    Total Available Credit Enhancement Amounts
                                                          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

<TABLE>
<CAPTION>
15.    Delinquency Summary

       End of Due Period Master Trust Receivables Outstanding $23,730,662,810.60

                                    Delinquent Amount            Percentage of Ending
       Payment Status               Ending Balance              Receivables Outstanding
<S>                                 <C>                         <C>  
       30-59 days                     $630,971,468.44                              2.66%

       60-179 days                  $1,084,269,351.39                              4.57%


</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                        $151,052,616.39

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                              $16,168,138.33

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                                                   $5,340,729.17
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $7,834,679.27

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $838,596.38

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                                                     $287,365.24

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998      Due Period Ending: July 31, 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:

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

       Series  1996-2                                        Total          Interest           Principal
<S>                           <C>                         <C>              <C>                <C>          
              Class A         33 days at 5.876250000%      $5.386562500    $5.386562500        $0.000000000

              Class B         33 days at 6.016250000%      $5.514895833    $5.514895833        $0.000000000
</TABLE>


<TABLE>
<CAPTION>
2.     Principal Receivables at the end of the Due Period
<S>                                                                                      <C>               
       (a)Aggregate Investor Interest                                                    $18,246,305,675.99
          Seller Interest                                                                 $5,100,331,762.00

          Total Master Trust                                                             $23,346,637,437.99


       (b)Group One Investor Interest                                                    $15,696,305,675.99

       (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>


<TABLE>
<CAPTION>
3.     Allocation of Receivables Collected During the Due Period
                                                         Finance Charge             Principal        Yield
                                                          Collections              Collections     Collections
<S>                                                     <C>                     <C>                <C>  
       (a)Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                 $296,997,296.09         $2,774,730,011.35     $0.00

          Seller                                         $38,441,258.33           $359,141,697.88     $0.00

       (b)Group One Allocation                          $255,771,897.76         $2,389,577,178.28     $0.00

       (c)Group Two Allocation                           $41,225,398.33           $385,152,833.07     $0.00

       (d)Series 1996-2 Allocations                      $15,295,998.08           $142,904,549.94     $0.00

       (e)Class A Allocations                            $14,524,489.41           $135,696,645.01     $0.00

          Class B Allocations                               $771,508.67             $7,207,904.93     $0.00
</TABLE>



<PAGE>   2

<TABLE>
<CAPTION>
4.     Information Concerning the Series Principal Funding Accounts ("SPFA")

                                    Deposits into the
                                        SPFAs This               SPFA   Deposit Deficit          Investment
                                        Due Period              Balance     Amount                 Income

<S>                                 <C>                         <C>     <C>                      <C>  
       Series 1996-2                            $0.00             $0.00            0.00               $0.00
</TABLE>


<TABLE>
<CAPTION>
5.     Information Concerning Amount of Controlled Liquidation Payments
                                                                                             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>


<TABLE>
<CAPTION>
6.     Information Concerning the Series Interest Funding Accounts ("SIFA")

                                                      Deposits Into the
                                                         SIFAs This
                                                          Due Period                           SIFA Balance
<S>                                                   <C>                                      <C>  
       Series 1996-2                                      $5,109,141.35                               $0.00
</TABLE>


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

       Class B                                                                                   1.00000000
</TABLE>


<TABLE>
<CAPTION>
8.     Investor Charged-Off Amount
                                                                                           Cumulative
                                                                                       Investor Charged-Off
                                                        This Due Period                       Amount
<S>                                                     <C>                            <C>  
       (a)Group One                                     $100,561,910.37                               $0.00

       (b)Group Two                                      $16,208,601.69                               $0.00

       (c)Series 1996-2                                   $6,013,931.96                               $0.00

       (d)Class A                                         $5,710,597.67                               $0.00

          Class B                                           $303,334.29                               $0.00
</TABLE>


<TABLE>
<CAPTION>
9.     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 1996-2                                           $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 1996-2                                           $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 1996-2                                           $0.00                               $0.00

       (d)Class A                                                 $0.00                               $0.00

          Class B                                                 $0.00                               $0.00
</TABLE>


<TABLE>
<CAPTION>
12.    Investor Monthly Servicing Fee Payable at the end of the Due Period
<S>                                                                                          <C>           
       (a)Group One                                                                          $26,375,787.22

       (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>


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


<TABLE>
<CAPTION>
14.    Total Available Credit Enhancement Amounts
                                                          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

<TABLE>
<CAPTION>
15.    Delinquency Summary

       End of Due Period Master Trust Receivables Outstanding         $23,730,662,810.60

                                    Delinquent Amount            Percentage of Ending
       Payment Status               Ending Balance              Receivables Outstanding
<S>                                 <C>                         <C>  
       30-59 days                     $630,971,468.44                              2.66%

       60-179 days                  $1,084,269,351.39                              4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                        $135,696,645.01

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                              $14,524,489.41

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                                                   $4,847,906.25
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $7,207,904.93

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $771,508.67

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                                                     $261,235.10

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998       Due Period Ending: July 31, 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:

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

       Series  1996-3                                        Total          Interest           Principal
<S>                           <C>                         <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>


<TABLE>
<CAPTION>
2.     Principal Receivables at the end of the Due Period
<S>                                                                                      <C>               
       (a)Aggregate Investor Interest                                                    $18,246,305,675.99
          Seller Interest                                                                 $5,100,331,762.00

          Total Master Trust                                                             $23,346,637,437.99


       (b)Group One Investor Interest                                                    $15,696,305,675.99

       (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>


<TABLE>
<CAPTION>
3.     Allocation of Receivables Collected During the Due Period
                                                         Finance Charge             Principal        Yield
                                                          Collections              Collections     Collections
<S>                                                     <C>                     <C>                <C>  
       (a)Allocation of Collections between Investor and Seller

          Aggregate Investor Allocation                 $296,997,296.09         $2,774,730,011.35     $0.00

          Seller                                         $38,441,258.33           $359,141,697.88     $0.00

       (b)Group One Allocation                          $255,771,897.76         $2,389,577,178.28     $0.00

       (c)Group Two Allocation                           $41,225,398.33           $385,152,833.07     $0.00

       (d)Series 1996-3 Allocations                      $10,197,332.05            $95,269,699.96     $0.00

       (e)Class A Allocations                             $9,694,174.22            $90,568,892.40     $0.00

          Class B Allocations                               $503,157.83             $4,700,807.56     $0.00
</TABLE>



<PAGE>   2

<TABLE>
<CAPTION>
4.     Information Concerning the Series Principal Funding Accounts ("SPFA")

                                    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>


<TABLE>
<CAPTION>
5.     Information Concerning Amount of Controlled Liquidation Payments
                                                                                             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>


<TABLE>
<CAPTION>
6.     Information Concerning the Series Interest Funding Accounts ("SIFA")

                                                      Deposits Into the
                                                         SIFAs This
                                                          Due Period                           SIFA Balance
<S>                                                   <C>                                      <C>  
       Series 1996-3                                      $3,189,473.96                               $0.00
</TABLE>


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

       Class B                                                                                   1.00000000
</TABLE>


<TABLE>
<CAPTION>
8.     Investor Charged-Off Amount
                                                                                           Cumulative
                                                                                       Investor Charged-Off
                                                        This Due Period                       Amount
<S>                                                     <C>                            <C>  
       (a)Group One                                     $100,561,910.37                               $0.00

       (b)Group Two                                      $16,208,601.69                               $0.00

       (c)Series 1996-3                                   $4,009,287.97                               $0.00

       (d)Class A                                         $3,811,461.26                               $0.00

          Class B                                           $197,826.71                               $0.00
</TABLE>


<TABLE>
<CAPTION>
9.     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>



<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>


<TABLE>
<CAPTION>
12.    Investor Monthly Servicing Fee Payable at the end of the Due Period
<S>                                                                                          <C>           
       (a)Group One                                                                          $26,375,787.22

       (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>


<TABLE>
<CAPTION>
13.    Class Available Subordinated Amount at the end of the Due Period
                                                                                            As a Percentage
                                                                                              of Class A
                                                                  Total                     Invested Amount
<S>                                                      <C>                                <C>     
       Series 1996-3 Class B                             $37,894,740.00                             6.3158%
</TABLE>


<TABLE>
<CAPTION>
14.    Total Available Credit Enhancement Amounts
                                                          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

<TABLE>
<CAPTION>
15.    Delinquency Summary

       End of Due Period Master Trust Receivables Outstanding $23,730,662,810.60

                                    Delinquent Amount            Percentage of Ending
       Payment Status               Ending Balance              Receivables Outstanding
<S>                                 <C>                         <C>  
       30-59 days                     $630,971,468.44                              2.66%

       60-179 days                  $1,084,269,351.39                              4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                         $90,568,892.40

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                               $9,694,174.22

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                                                  $18,150,000.00
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $4,700,807.56

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $503,157.83

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                                                     $986,843.76

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998        Due Period Ending: July 31, 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:

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

       Series  1996-4                                        Total          Interest           Principal
<S>                           <C>                         <C>              <C>                <C>          
              Class A         33 days at 6.031250000%      $5.528645833    $5.528645833        $0.000000000

              Class B         33 days at 6.206250000%      $5.689062500    $5.689062500        $0.000000000
</TABLE>


<TABLE>
<CAPTION>
2.     Principal Receivables at the end of the Due Period
<S>                                                                                      <C>               
       (a)Aggregate Investor Interest                                                    $18,246,305,675.99
          Seller Interest                                                                 $5,100,331,762.00

          Total Master Trust                                                             $23,346,637,437.99


       (b)Group One Investor Interest                                                    $15,696,305,675.99

       (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>


<TABLE>
<CAPTION>
3.     Allocation of Receivables Collected During the Due Period

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

          Aggregate Investor Allocation                 $296,997,296.09         $2,774,730,011.35     $0.00

          Seller                                         $38,441,258.33           $359,141,697.88     $0.00

       (b)Group One Allocation                          $255,771,897.76         $2,389,577,178.28     $0.00

       (c)Group Two Allocation                           $41,225,398.33           $385,152,833.07     $0.00

       (d)Series 1996-4 Allocations                      $17,006,734.71           $158,887,295.66     $0.00

       (e)Class A Allocations                            $16,168,138.33           $151,052,616.39     $0.00

          Class B Allocations                               $838,596.38             $7,834,679.27     $0.00
</TABLE>



<PAGE>   2

<TABLE>
<CAPTION>
4.     Information Concerning the Series Principal Funding Accounts ("SPFA")

                                    Deposits into the
                                        SPFAs This               SPFA   Deposit Deficit          Investment
                                        Due Period              Balance     Amount                 Income

<S>                                 <C>                         <C>     <C>                      <C>  
       Series 1996-4                            $0.00             $0.00            0.00               $0.00
</TABLE>


<TABLE>
<CAPTION>
5.     Information Concerning Amount of Controlled Liquidation Payments
                                                                                             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>


<TABLE>
<CAPTION>
6.     Information Concerning the Series Interest Funding Accounts ("SIFA")

                                                      Deposits Into the
                                                         SIFAs This
                                                          Due Period                           SIFA Balance
<S>                                                   <C>                                      <C>  
       Series 1996-4                                      $5,828,072.57                               $0.00
</TABLE>


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

       Class B                                                                                   1.00000000
</TABLE>


<TABLE>
<CAPTION>
8.     Investor Charged-Off Amount
                                                                                           Cumulative
                                                                                       Investor Charged-Off
                                                        This Due Period                       Amount
<S>                                                     <C>                            <C>  
       (a)Group One                                     $100,561,910.37                               $0.00

       (b)Group Two                                      $16,208,601.69                               $0.00

       (c)Series 1996-4                                   $6,686,542.76                               $0.00

       (d)Class A                                         $6,356,831.58                               $0.00

          Class B                                           $329,711.18                               $0.00
</TABLE>


<TABLE>
<CAPTION>
9.     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>



<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>


<TABLE>
<CAPTION>
12.    Investor Monthly Servicing Fee Payable at the end of the Due Period
<S>                                                                                          <C>           
       (a)Group One                                                                          $26,375,787.22

       (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>


<TABLE>
<CAPTION>
13.    Class Available Subordinated Amount at the end of the Due Period
                                                                                            As a Percentage
                                                                                              of Class A
                                                                  Total                     Invested Amount
<S>                                                      <C>                                <C>     
       Series 1996-4 Class B                            $115,789,520.00                             11.5790%
</TABLE>


<TABLE>
<CAPTION>
14.    Total Available Credit Enhancement Amounts
                                                          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

<TABLE>
<CAPTION>
15.    Delinquency Summary

       End of Due Period Master Trust Receivables Outstanding $23,730,662,810.60

                                    Delinquent Amount            Percentage of Ending
       Payment Status               Ending Balance              Receivables Outstanding
<S>                                 <C>                         <C>  
       30-59 days                     $630,971,468.44                              2.66%

       60-179 days                  $1,084,269,351.39                              4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                        $151,052,616.39

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                              $16,168,138.33

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                                                   $5,528,645.83
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $7,834,679.27

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $838,596.38

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                                                     $299,426.74

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998       Due Period Ending:  July 31, 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      33 days at 5.746250000%         $5.267395833    $5.267395833        $0.000000000

              Class B      33 days at 5.926250000%         $5.432395833    $5.432395833        $0.000000000
</TABLE>

2.     Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                          <C>               
       (a)Aggregate Investor Interest                        $18,246,305,675.99

          Seller Interest                                     $5,100,331,762.00

          Total Master Trust                                 $23,346,637,437.99


       (b)Group One Investor Interest                        $15,696,305,675.99

       (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                 $296,997,296.09                   $2,774,730,011.35                    $0.00

          Seller                                         $38,441,258.33                     $359,141,697.88                    $0.00

       (b)Group One Allocation                          $255,771,897.76                   $2,389,577,178.28                    $0.00

       (c)Group Two Allocation                           $41,225,398.33                     $385,152,833.07                    $0.00

       (d)Series 1997-1 Allocations                      $12,746,665.07                     $119,087,124.95                    $0.00

       (e)Class A Allocations                            $12,109,331.81                     $113,132,768.70                    $0.00

          Class B Allocations                               $637,333.26                       $5,954,356.25                    $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                         $4,164,985.27                 $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                           $100,561,910.37                     $0.00

       (b)Group Two                            $16,208,601.69                     $0.00

       (c)Series 1997-1                         $5,011,609.96                     $0.00

       (d)Class A                               $4,761,029.46                     $0.00

          Class B                                 $250,580.50                     $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>
                                                                            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>

     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 1997-1                                           $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                                                      $26,375,787.22

       (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     $23,730,662,810.60
</TABLE>

<TABLE>
<CAPTION>
                                      Delinquent Amount          Percentage of Ending
          Payment Status               Ending Balance           Receivables Outstanding
<S>                                 <C>                         <C>
          30-59 days                  $630,971,468.44                    2.66%

          60-179 days               $1,084,269,351.39                    4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                        $113,132,768.70

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                              $12,109,331.81

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                                                   $3,950,546.88
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $5,954,356.25

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $637,333.26

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                                                     $214,438.39

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998       Due Period Ending:  July 31, 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>                 <C>
              Class A      30 days at 6.792000000%  $5.660000000           $5.660000000        $0.000000000

              Class B      33 days at 6.056250000%  $5.551562500           $5.551562500        $0.000000000
</TABLE>

     2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                  <C>               
       (a)Aggregate Investor Interest                                $18,246,305,675.99
          Seller Interest                                             $5,100,331,762.00

          Total Master Trust                                         $23,346,637,437.99


       (b)Group One Investor Interest                                $15,696,305,675.99

       (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                 $296,997,296.09                   $2,774,730,011.35                    $0.00

          Seller                                         $38,441,258.33                     $359,141,697.88                    $0.00

       (b)Group One Allocation                          $255,771,897.76                   $2,389,577,178.28                    $0.00

       (c)Group Two Allocation                           $41,225,398.33                     $385,152,833.07                    $0.00

       (d)Series 1997-2 Allocations                       $8,520,139.28                      $79,600,341.41                    $0.00

       (e)Class A Allocations                             $8,084,069.16                      $75,526,308.19                    $0.00

          Class B Allocations                               $436,070.12                       $4,074,033.22                    $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                                   $2,976,094.92           $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                                     $100,561,910.37            $0.00

       (b)Group Two                                      $16,208,601.69            $0.00

       (c)Series 1997-2                                   $3,349,865.60            $0.00

       (d)Class A                                         $3,178,415.79            $0.00

          Class B                                           $171,449.81            $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                                                      $26,375,787.22

       (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                         $23,730,662,810.60
</TABLE>

<TABLE>
<CAPTION>
                                      Delinquent Amount          Percentage of Ending
          Payment Status               Ending Balance           Receivables Outstanding
<S>                                 <C>                         <C>
          30-59 days                  $630,971,468.44                     2.66%

          60-179 days               $1,084,269,351.39                     4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                         $75,526,308.19

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                               $8,084,069.16

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                                                          $4,074,033.22

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $436,070.12

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                                                     $146,094.92

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998       Due Period Ending:  July 31, 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>                 <C>
              Class A      33 days at 5.786250000%         $5.304062500    $5.304062500        $0.000000000

              Class B      33 days at 5.966250000%         $5.469062500    $5.469062500        $0.000000000
</TABLE>

2.     Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                  <C>               
       (a)Aggregate Investor Interest                                $18,246,305,675.99
          Seller Interest                                             $5,100,331,762.00

          Total Master Trust                                         $23,346,637,437.99


       (b)Group One Investor Interest                                $15,696,305,675.99

       (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                 $296,997,296.09                   $2,774,730,011.35                    $0.00

          Seller                                         $38,441,258.33                     $359,141,697.88                    $0.00

       (b)Group One Allocation                          $255,771,897.76                   $2,389,577,178.28                    $0.00

       (c)Group Two Allocation                           $41,225,398.33                     $385,152,833.07                    $0.00

       (d)Series 1997-3 Allocations                      $11,035,928.45                     $103,104,379.23                    $0.00

       (e)Class A Allocations                            $10,499,226.76                      $98,090,184.50                    $0.00

          Class B Allocations                               $536,701.69                       $5,014,194.73                    $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                         $3,634,742.73              $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                                     $100,561,910.37           $0.00

       (b)Group Two                                      $16,208,601.69           $0.00

       (c)Series 1997-3                                   $4,338,999.15           $0.00

       (d)Class A                                         $4,127,983.99           $0.00

          Class B                                           $211,015.16           $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       

<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                                      $26,375,787.22

       (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     $23,730,662,810.60
</TABLE>

<TABLE>
<CAPTION>
                                      Delinquent Amount      Percentage of Ending
          Payment Status               Ending Balance       Receivables Outstanding
<S>                                 <C>                     <C>
          30-59 days                  $630,971,468.44              2.66%

          60-179 days               $1,084,269,351.39              4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                         $98,090,184.50

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                              $10,499,226.76

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                                                   $3,447,640.63
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $5,014,194.73

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $536,701.69

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                                                     $187,102.10

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998       Due Period Ending:  July 31, 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>                 <C>
              Class A          33 days at 5.726250000%     $5.249062500    $5.249062500        $0.000000000

              Class B          33 days at 5.906250000%     $5.414062500    $5.414062500        $0.000000000
</TABLE>

     2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                  <C>               
       (a)Aggregate Investor Interest                                $18,246,305,675.99
          Seller Interest                                             $5,100,331,762.00

          Total Master Trust                                         $23,346,637,437.99


       (b)Group One Investor Interest                                $15,696,305,675.99

       (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                 $296,997,296.09                   $2,774,730,011.35                    $0.00

          Seller                                         $38,441,258.33                     $359,141,697.88                    $0.00

       (b)Group One Allocation                          $255,771,897.76                   $2,389,577,178.28                    $0.00

       (c)Group Two Allocation                           $41,225,398.33                     $385,152,833.07                    $0.00

       (d)Series 1997-4 Allocations                      $12,746,665.07                     $119,087,124.95                    $0.00

       (e)Class A Allocations                            $12,109,331.81                     $113,132,768.70                    $0.00

          Class B Allocations                               $637,333.26                       $5,954,356.25                    $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                 $4,150,511.58             $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                                     $100,561,910.37           $0.00

       (b)Group Two                                      $16,208,601.69           $0.00

       (c)Series 1997-4                                   $5,011,609.96           $0.00

       (d)Class A                                         $4,761,029.46           $0.00

          Class B                                           $250,580.50           $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                                                      $26,375,787.22

       (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     $23,730,662,810.60
</TABLE>

<TABLE>
<CAPTION>
                                      Delinquent Amount     Percentage of Ending
          Payment Status               Ending Balance      Receivables Outstanding
<S>                                 <C>                    <C>
          30-59 days                  $630,971,468.44              2.66%

          60-179 days               $1,084,269,351.39              4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                        $113,132,768.70

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                              $12,109,331.81

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                                                   $3,936,796.88
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $5,954,356.25

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $637,333.26

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                                                     $213,714.70

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.

      IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 17th day of August, 1998.
</TABLE>



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998 Due Period Ending: July 31, 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>                 <C>
              Class A      33 days at 5.746250000%         $5.267395833    $5.267395833        $0.000000000

              Class B      33 days at 5.926250000%         $5.432395833    $5.432395833        $0.000000000
</TABLE>

     2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                                  <C>               
       (a)Aggregate Investor Interest                                $18,246,305,675.99
          Seller Interest                                             $5,100,331,762.00

          Total Master Trust                                         $23,346,637,437.99


       (b)Group One Investor Interest                                $15,696,305,675.99

       (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                 $296,997,296.09                   $2,774,730,011.35                    $0.00

          Sellers                                        $38,441,258.33                     $359,141,697.88                    $0.00

       (b)Group One Allocation                          $255,771,897.76                   $2,389,577,178.28                    $0.00

       (c)Group Two Allocation                           $41,225,398.33                     $385,152,833.07                    $0.00

       (d)Series 1998-1 Allocations                       $5,970,806.27                      $55,782,916.43                    $0.00

       (e)Class A Allocations                             $5,668,911.57                      $52,962,431.89                    $0.00

          Class B Allocations                               $301,894.70                       $2,820,484.54                    $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 1998-1                         $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
                                                           Due Period          SIFA Balance
<S>                                                     <C>                    <C>
          Series 1998-1                                   $1,943,664.14           $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                                     $100,561,910.37           $0.00

       (b)Group Two                                      $16,208,601.69           $0.00

       (c)Series 1998-1                                   $2,347,543.62           $0.00

       (d)Class A                                         $2,228,847.59           $0.00

          Class B                                           $118,696.03           $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
     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 1998-1                                 $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 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                                                      $26,375,787.22

       (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     $23,730,662,810.60
</TABLE>

<TABLE>
<CAPTION>
                                     Delinquent Amount       Percentage of Ending
          Payment Status              Ending Balance        Receivables Outstanding
<S>                                 <C>                     <C>
          30-59 days                  $630,971,468.44              2.66%

          60-179 days               $1,084,269,351.39              4.57%
</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                         $52,962,431.89

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                               $5,668,911.57

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                                                   $1,843,588.54
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $2,820,484.54

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $301,894.70

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                                                     $100,075.60

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998       Due Period Ending:  July 31, 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>             <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                          $18,246,305,675.99
         Seller Interest                                       $5,100,331,762.00

         Total Master Trust                                   $23,346,637,437.99


     (b) Group One Investor Interest                          $15,696,305,675.99

     (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

     (a) Allocation of Collections between Investor and Seller
<S>                                      <C>                     <C>                           <C>  
         Aggregate Investor Allocation   $296,997,296.09          $2,774,730,011.35            $0.00

         Seller                           $38,441,258.33            $359,141,697.88            $0.00

     (b) Group One Allocation            $255,771,897.76          $2,389,577,178.28            $0.00

     (c) Group Two Allocation             $41,225,398.33            $385,152,833.07            $0.00

     (d) Series 1998-2 Allocations         $8,520,139.28             $79,600,341.41            $0.00

     (e) Class A Allocations               $8,084,069.16             $75,526,308.19            $0.00

         Class B Allocations                 $436,070.12              $4,074,033.22            $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 1998-2                              $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             $13,669,705.91
</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                           $100,561,910.37             $0.00

     (b) Group Two                            $16,208,601.69             $0.00

     (c) Series 1998-2                         $3,349,865.60             $0.00

     (d) Class A                               $3,178,415.79             $0.00

         Class B                                 $171,449.81             $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





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 1998-2                                 $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 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                                                $26,375,787.22

     (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

     End of Due Period Master Trust Receivables Outstanding$23,730,662,810.60

<TABLE>
<CAPTION>
                                    Delinquent Amount       Percentage of Ending
     Payment Status                  Ending Balance        Receivables Outstanding
<S>                                 <C>                    <C>  
     30-59 days                       $630,971,468.44              2.66%

     60-179 days                    $1,084,269,351.39              4.57%

</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                         $75,526,308.19

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                               $8,084,069.16

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                                                          $4,074,033.22

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $436,070.12

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998       Due Period Ending:  July 31, 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>                 <C>         
          Class A              33 days at 5.781250000%     $5.299479167    $5.299479167        $0.000000000

          Class B              33 days at 5.946250000%     $5.450729167    $5.450729167        $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                           <C>               
     (a) Aggregate Investor Interest                          $18,246,305,675.99
         Seller Interest                                       $5,100,331,762.00

         Total Master Trust                                   $23,346,637,437.99


     (b) Group One Investor Interest                          $15,696,305,675.99

     (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   $296,997,296.09       $2,774,730,011.35            $0.00

         Seller                           $38,441,258.33         $359,141,697.88            $0.00

     (b) Group One Allocation            $255,771,897.76       $2,389,577,178.28            $0.00

     (c) Group Two Allocation             $41,225,398.33         $385,152,833.07            $0.00

     (d) Series 1998-3 Allocations        $12,746,665.07         $119,087,124.95            $0.00

     (e) Class A Allocations              $12,109,331.81         $113,132,768.70            $0.00

         Class B Allocations                 $637,333.26           $5,954,356.25            $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                      $4,189,771.46             $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                       $100,561,910.37            $0.00

     (b) Group Two                        $16,208,601.69            $0.00

     (c) Series 1998-3                     $5,011,609.96            $0.00

     (d) Class A                           $4,761,029.46            $0.00

         Class B                             $250,580.50            $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


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 1998-3                                 $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 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                                            $26,375,787.22

     (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

     End of Due Period Master Trust Receivables Outstanding$23,730,662,810.60

<TABLE>
<CAPTION>
                         Delinquent Amount    Percentage of Ending
     Payment Status      Ending Balance       Receivables Outstanding
<S>                     <C>                   <C>  
     30-59 days           $630,971,468.44            2.66%

     60-179 days        $1,084,269,351.39            4.57%

</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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                        $113,132,768.70

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                              $12,109,331.81

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                                                   $3,974,609.38
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                       <C>
9.    The aggregate amount of Class B Principal Collections processed during the
      related Due Period is equal to                                                          $5,954,356.25

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $637,333.26

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                                                     $215,162.08

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                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: August 17, 1998       Due Period Ending:  July 31, 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>                 <C>         
          Class A             30 days at 5.750000000%      $4.791666667    $4.791666667        $0.000000000

          Class B             30 days at 5.900000000%      $4.916666667    $4.916666667        $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                         <C>               
     (a) Aggregate Investor Interest                        $18,246,305,675.99
         Seller Interest                                     $5,100,331,762.00

         Total Master Trust                                 $23,346,637,437.99


     (b) Group One Investor Interest                        $15,696,305,675.99

     (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   $296,997,296.09       $2,774,730,011.35            $0.00

          Seller                          $38,441,258.33         $359,141,697.88            $0.00

     (b) Group One Allocation            $255,771,897.76       $2,389,577,178.28            $0.00

     (c) Group Two Allocation             $41,225,398.33         $385,152,833.07            $0.00

     (d) Series 1998-4 Allocations         $8,520,139.28          $79,600,341.41            $0.00

     (e) Class A Allocations               $8,084,069.16          $75,526,308.19            $0.00

         Class B Allocations                 $436,070.12           $4,074,033.22            $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 1998-4                              $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
                                          Due Period               SIFA Balance
<S>                                    <C>                        <C>           
     Series 1998-4                      $2,525,220.33             $10,605,925.39
</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                           $100,561,910.37               $0.00

     (b) Group Two                            $16,208,601.69               $0.00

     (c) Series 1998-4                         $3,349,865.60               $0.00

     (d) Class A                               $3,178,415.79               $0.00

         Class B                                 $171,449.81               $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


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 1998-4                                 $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 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                                                $26,375,787.22

     (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

     End of Due Period Master Trust Receivables Outstanding   $23,730,662,810.60

                        Delinquent Amount         Percentage of Ending
     Payment Status      Ending Balance           Receivables Outstanding

     30-59 days           $630,971,468.44                 2.66%

     60-179 days        $1,084,269,351.39                 4.57%


                                           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 August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                         $75,526,308.19

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                               $8,084,069.16

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                                                          $4,074,033.22

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $436,070.12

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                and Treasurer



<PAGE>   1

                                                                   EXHIBIT (V)


                      MONTHLY CERTIFICATEHOLDERS' STATEMENT
                          Discover Card Master Trust I
                         Series 1998-6 Monthly Statement
                      Class A Certificate CUSIP #25466KBY4
                      Class B Certificate CUSIP #25466KBZ1


Trust Distribution Date: August 17, 1998       Due Period Ending:  July 31, 1998

Pursuant to the Series Supplement dated as of July 30, 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>
     Series  1998-6                                            Total         Interest     Principal
<S>                            <C>                         <C>             <C>           <C>         
        Class A                15 days at 5.850000000%     $2.437500000    $2.437500000  $0.000000000

        Class B                15 days at 6.050000000%     $2.520833333    $2.520833333  $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period

<TABLE>
<S>                                                         <C>               
     (a) Aggregate Investor Interest                        $18,246,305,675.99
         Seller Interest                                     $5,100,331,762.00

          Total Master Trust                                 $23,346,637,437.99


     (b) Group One Investor Interest                        $15,696,305,675.99

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

     (d) Series 1998-6 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   $296,997,296.09       $2,774,730,011.35            $0.00

         Seller                           $38,441,258.33         $359,141,697.88            $0.00

     (b) Group One Allocation            $255,771,897.76       $2,389,577,178.28            $0.00

     (c) Group Two Allocation             $41,225,398.33         $385,152,833.07            $0.00

     (d) Series 1998-6 Allocations         $8,520,139.28          $79,600,341.41            $0.00

     (e) Class A Allocations               $8,084,069.16          $75,526,308.19            $0.00

         Class B Allocations                 $436,070.12           $4,074,033.22            $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 1998-6               $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 1998-6                 $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 1998-6                               $1,285,088.25       $1,285,088.25
</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                           $100,561,910.37            $0.00

     (b) Group Two                            $16,208,601.69            $0.00

     (c) Series 1998-6                         $3,349,865.60            $0.00

     (d) Class A                               $3,178,415.79            $0.00

         Class B                                 $171,449.81            $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 1998-6                                 $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 1998-6                                 $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 1998-6                                 $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                                            $26,375,787.22

     (b) Group Two                                             $4,250,000.00

     (c) Series 1998-6                                           $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 1998-6 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

     End of Due Period Master Trust Receivables Outstanding$23,730,662,810.60

<TABLE>
<CAPTION>
                      Delinquent Amount      Percentage of Ending
     Payment Status    Ending Balance        Receivables Outstanding
<S>                   <C>                    <C>  
     30-59 days         $630,971,468.44             2.66%

     60-179 days      $1,084,269,351.39             4.57%

</TABLE>

                                           U.S. BANK NATIONAL ASSOCIATION
                                           as Trustee


                                       BY: _____________________________________

                                                 Vice President



<PAGE>   5
                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1998-6 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 July 30, 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 1998-6 Master Trust
      Certificates for the Distribution Date occurring on August 17, 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                                                                  $3,469,310,263.63

4.    The aggregate amount of Class A Principal Collections processed during the
      related Due Period is equal to                                                         $75,526,308.19

5.    The aggregate amount of Class A Finance Charge Collections processed
      during the related Due Period is equal to                                               $8,084,069.16

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                                                          $4,074,033.22

10.   The aggregate amount of Class B Finance Charge Collections processed
      during the related Due Period is equal to                                                 $436,070.12

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 17th day of August, 1998.



                                GREENWOOD TRUST COMPANY
                                     as Master Servicer

                                By:_________________________
                                Vice President, Chief Accounting Officer,
                                and Treasurer




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