DISCOVER CARD MASTER TRUST I
424B3, 1998-09-15
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),
AUGUST 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): September 15, 1998


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


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


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


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


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

                                  Page 1 of 141
                         Index to Exhibits is on page 8


<PAGE>   2

Item 5.  Other Events
         ------------

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

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

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

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

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

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

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

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

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

                                       2

<PAGE>   3

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

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

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

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

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

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

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

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

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

                                       3

<PAGE>   4

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

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

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

V) Series 1998-6:
   --------------
On September 15, 1998 the Registrant made available the Monthly
Certificateholders Statement for the August 1998 Due Period with respect to
Series 1998-6, which is attached as Exhibit 20(v) hereto.

W) Series 1994-3:
   --------------
As of September 15, 1998, Greenwood Trust Company as Master Servicer under the
Series 1994-3 Supplement, between Greenwood Trust Company as Master Servicer,
Servicer and Seller and U.S. Bank National Association (formerly First Bank
National Association, successor trustee to Bank of America Illinois, formerly
Continental Bank, National Association) as Trustee, dated as of October 20,
1994 (the "Series 1994-3 Supplement"), elected pursuant to Section 20 of the
Series 1994-3 Supplement to delay the commencement of the Accumulation Period
until the first day of the Due Period related to the May 1999 Distribution Date
(as each such term is defined in the "Series 1994-3 Supplement").

                                       4

<PAGE>   5

Item 7.  Financial Statements and Exhibits
         ---------------------------------
(c) Exhibits

<TABLE>
<CAPTION>
Exhibit No.     Description
- -----------     -----------
<S>             <C>
20(a)           Monthly Certificateholders' Statement, related to the Due Period ending
                August 31, 1998, for Series 1993-1.

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

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

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

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

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

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

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

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

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

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

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

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

20(n)           Monthly Certificateholders' Statement, related to the Due Period ending
                August 31, 1998, for Series 1997-1.
</TABLE>

                                       5

<PAGE>   6

<TABLE>
<S>             <C>
20(o)           Monthly Certificateholders' Statement, related to the Due Period ending
                August 31, 1998, for Series 1997-2.

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

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

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

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

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

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

20(v)           Monthly Certificateholders' Statement, related to the Due Period ending
                August 31, 1998, for Series 1998-6.
</TABLE>

                                       6

<PAGE>   7

                                   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: September 15, 1998

                                       7

<PAGE>   8

                                  EXHIBIT INDEX
<TABLE>
<CAPTION>
Exhibit No.      Description
- -----------      -----------
<S>              <C>
20(a)            Monthly Certificateholders' Statement, related to the Due Period ending
                 August 31, 1998, for Series 1993-1.

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

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

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

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

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

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

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

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

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

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

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

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

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

20(o)            Monthly Certificateholders' Statement, related to the Due Period ending
                 August 31, 1998, for Series 1997-2.
</TABLE>

                                       8

<PAGE>   9

<TABLE>
<S>              <C>
20(p)            Monthly Certificateholders' Statement, related to the Due Period ending
                 August 31, 1998, for Series 1997-3.

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

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

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

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

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

20(v)            Monthly Certificateholders' Statement, related to the Due Period ending
                 August 31, 1998, for Series 1998-6.
</TABLE>

                                       9

<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: September 15, 1998   Due Period Ending: August 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:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     --------------------------------------------------------------------------
     Class Initial Investor Interest)
     --------------------------------
<TABLE>
<CAPTION>
Series  1993-1                                   Total           Interest         Principal
<S>               <C>                        <C>              <C>               <C>
Class A           29 days at 5.910630000%    $86.507560556    $3.174227222      $83.333333333

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

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
<S>                                                          <C>
      (a) Aggregate Investor Interest                         $18,117,139,009.32
          Seller Interest                                      $5,596,919,006.55

          Total Master Trust                                  $23,714,058,015.87


      (b) Group One Investor Interest                         $15,567,139,009.32

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

      (d) Series 1993-1 Investor Interest                        $485,373,000.00

      (e) Class A Investor Interest                              $437,500,000.00

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

3.   Allocation of Receivables Collected During the Due Period
     ---------------------------------------------------------
<TABLE>
<CAPTION>
                                                   Finance Charge          Principal               Yield
                                                    Collections            Collections          Collections

      (a) Allocation of Collections between Investor and Seller
<S>                                                <C>                  <C>                         <C>

          Aggregate Investor Allocation            $310,248,377.67      $2,465,220,139.53           $0.00

          Seller                                    $86,844,131.84        $690,059,701.17           $0.00

      (b) Group One Allocation                     $266,846,166.39      $2,120,348,052.94           $0.00

      (c) Group Two Allocation                      $43,402,211.28        $344,872,086.59           $0.00

      (d) Series 1993-1 Allocations                  $9,331,673.97         $74,149,076.26           $0.00

      (e) Class A Allocations                        $8,497,779.70         $67,522,988.59           $0.00

          Class B Allocations                          $833,894.27          $6,626,087.67           $0.00
</TABLE>

<PAGE>   2

4.   Information Concerning the Series Principal Funding Accounts ("SPFA")
     ---------------------------------------------------------------------
<TABLE>
<CAPTION>
                             Deposits into the
                                SPFAs This           SPFA     Deposit Deficit   Investment
                                Due Period          Balance       Amount           Income
<S>                           <C>                    <C>           <C>             <C>
          Series 1993-1       $62,500,000.00         $0.00         0.00            $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments
     ----------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                    Total Payments
                                Amount Paid       Deficit Amount     Through This
                              This Due Period    This Due Period      Due Period
<S>                            <C>                       <C>        <C>
          Series 1993-1        $62,500,000.00            $0.00      $312,500,000.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")
     --------------------------------------------------------------------
<TABLE>
<CAPTION>
                                             Deposits Into the
                                                SIFAs This
                                                Due Period            SIFA Balance
<S>                                             <C>                      <C>
          Series 1993-1                         $2,592,109.50            $0.00
</TABLE>

7.   Pool Factors
     ------------
<TABLE>
<CAPTION>
                                                                  This Due Period
<S>                                                               <C>
          Class A                                                 0.58333333

          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                       $87,822,805.20                  $0.00

      (b) Group Two                       $14,284,274.70                  $0.00

      (c) Series 1993-1                    $3,071,184.41                  $0.00

      (d) Class A                          $2,796,738.14                  $0.00

          Class B                            $274,446.27                  $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                              $0.00          $0.00

      (d) Class A                             $0.00          $0.00

          Class B                             $0.00          $0.00
</TABLE>



<PAGE>   3



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

      (b) Group Two                                     $0.00          $0.00

      (c) Series 1993-1                                 $0.00          $0.00

      (d) Class A                                       $0.00          $0.00

          Class B                                       $0.00          $0.00
</TABLE>



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

      (b) Group Two                                     $0.00          $0.00

      (c) Series 1993-1                                 $0.00          $0.00

      (d) Class A                                       $0.00          $0.00

          Class B                                       $0.00          $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period
     -------------------------------------------------------------------
<TABLE>
<S>                                                            <C>
      (a) Group One                                            $26,160,509.44

      (b) Group Two                                             $4,250,000.00

      (c) Series 1993-1                                           $913,121.66

      (d) Class A                                                 $833,333.33

          Class B                                                  $79,788.33
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period
     ----------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                  As a Percentage
                                                                    of Class A
                                                      Total       Invested Amount
<S>                                              <C>                 <C>
          Series 1993-1 Class B                   $63,829,840.00      14.5897%
</TABLE>

14.  Total Available Credit Enhancement Amounts
     ------------------------------------------
<TABLE>
<CAPTION>
                                                      Shared Amount     Class B Amount
<S>                                                   <C>               <C>
          Maximum Amount                               $12,134,325.00    $15,957,460.00

          Available Amount                             $12,134,325.00    $15,957,460.00

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



<PAGE>   4

15.  Delinquency Summary
     -------------------

     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                              Delinquent Amount      Percentage of Ending
          Payment Status      Ending Balance        Receivables Outstanding
          <S>                 <C>                   <C>
          30-59 days            $637,811,902.88             2.65%

          60-179 days         $1,137,628,872.80             4.72%
</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 September 15, 1998:

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

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

      3.  The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                 $3,552,372,350.30

      4.  The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                    $67,522,988.59

      5.  The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                              $8,497,779.70

      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                                          $64,880,670.42
</TABLE>


<PAGE>   6
<TABLE>
    <S>                                                                                         <C>
      9.  The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                     $6,626,087.67

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                $833,894.27

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

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

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

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

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

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

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

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

          IN WITNESS WHEREOF, the undersigned has duly executed and delivered
      certificate this  15th day of September, 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: September 15, 1998   Due Period Ending: August 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:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     --------------------------------------------------------------------------
     Class Initial Investor Interest)
     --------------------------------
<TABLE>
<CAPTION>
          Series  1993-2                                   Total           Interest        Principal
<S>                        <C>                         <C>               <C>             <C>
              Class A      30 days at 5.400000000%     $86.708333337     $3.375000000    $83.333333338

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

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
<S>                                                          <C>
      (a) Aggregate Investor Interest                        $18,117,139,009.32
          Seller Interest                                     $5,596,919,006.55

          Total Master Trust                                 $23,714,058,015.87


      (b) Group One Investor Interest                        $15,567,139,009.32

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

      (d) Series 1993-2 Investor Interest                       $566,667,333.32

      (e) Class A Investor Interest                             $533,333,333.32

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

3.   Allocation of Receivables Collected During the Due Period
     ---------------------------------------------------------
<TABLE>
<CAPTION>
                                                    Finance Charge        Principal            Yield
                                                     Collections         Collections        Collections

      (a) Allocation of Collections between Investor and Seller
<S>                                             <C>                 <C>                         <C>
          Aggregate Investor Allocation           $310,248,377.67     $2,465,220,139.53           $0.00

          Seller                                   $86,844,131.84       $690,059,701.17           $0.00

      (b) Group One Allocation                    $266,846,166.39     $2,120,348,052.94           $0.00

      (c) Group Two Allocation                     $43,402,211.28       $344,872,086.59           $0.00

      (d) Series 1993-2 Allocations                $10,761,207.01        $85,508,083.69           $0.00

      (e) Class A Allocations                      $10,205,277.50        $81,090,691.91           $0.00

          Class B Allocations                         $555,929.51         $4,417,391.78           $0.00
</TABLE>



<PAGE>   2

4.   Information Concerning the Series Principal Funding Accounts ("SPFA")
     ---------------------------------------------------------------------
<TABLE>
<CAPTION>
                            Deposits into the
                               SPFAs This          SPFA      Deposit Deficit   Investment
                               Due Period         Balance         Amount         Income
<S>                          <C>                   <C>             <C>            <C>
          Series 1993-2      $66,666,666.67        $0.00            0.00          $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments
     ----------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                          Total Payments
                                 Amount Paid        Deficit Amount         Through This
                              This Due Period      This Due Period          Due Period
<S>                            <C>                       <C>             <C>
          Series 1993-2        $66,666,666.67            $0.00           $266,666,666.68
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")
     --------------------------------------------------------------------
<TABLE>
<CAPTION>
                                              Deposits Into the
                                                 SIFAs This
                                                 Due Period            SIFA Balance
<S>                                             <C>                         <C>
          Series 1993-2                         $2,859,725.42               $0.00
</TABLE>

7.   Pool Factors
     ------------
<TABLE>
<CAPTION>
                                                                  This Due Period
<S>                                                               <C>
          Class A                                                 0.66666667

          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                   $87,822,805.20                       $0.00

      (b) Group Two                   $14,284,274.70                       $0.00

      (c) Series 1993-2                $3,541,663.72                       $0.00

      (d) Class A                      $3,358,699.54                       $0.00

          Class B                        $182,964.18                       $0.00
</TABLE>

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

      (b) Group Two                          $0.00                  $0.00

      (c) Series 1993-2                      $0.00                  $0.00

      (d) Class A                            $0.00                  $0.00

          Class B                            $0.00                  $0.00
</TABLE>



<PAGE>   3

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

      (b) Group Two                                     $0.00          $0.00

      (c) Series 1993-2                                 $0.00          $0.00

      (d) Class A                                       $0.00          $0.00

          Class B                                       $0.00          $0.00
</TABLE>

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

      (b) Group Two                                     $0.00          $0.00

      (c) Series 1993-2                                 $0.00          $0.00

      (d) Class A                                       $0.00          $0.00

          Class B                                       $0.00          $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period
     -------------------------------------------------------------------
<TABLE>
<S>                                                            <C>
      (a) Group One                                            $26,160,509.44

      (b) Group Two                                             $4,250,000.00

      (c) Series 1993-2                                         $1,055,556.67

      (d) Class A                                               $1,000,000.00

          Class B                                                  $55,556.67
</TABLE>

13.  Class Available Subordinated Amount at the end of the Due Period
     ----------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                  As a Percentage
                                                                    of Class A
                                                      Total       Invested Amount
<S>                                               <C>                <C>
          Series 1993-2 Class B                   $50,000,040.00     9.3750%
</TABLE>

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

15.  Delinquency Summary
     -------------------

     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                              Delinquent Amount        Percentage of Ending
          Payment Status      Ending Balance          Receivables Outstanding
          <S>               <C>                       <C>
          30-59 days          $637,811,902.88                  2.65%

          60-179 days       $1,137,628,872.80                  4.72%
</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 September 15, 1998:


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

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

      3.  The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                  $3,552,372,350.30

      4.  The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                     $81,090,691.91

      5.  The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                              $10,205,277.50

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

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

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

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

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

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

      8.  The sum of all amounts payable to the Class A Certificateholders
          on the current Distribution Date is equal to                                           $69,366,666.67
</TABLE>

<PAGE>   6
<TABLE>
<S>                                                                                            <C>
      9.  The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                     $4,417,391.78

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                $555,929.51

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

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

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

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

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

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

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

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

          IN WITNESS WHEREOF, the undersigned has duly executed and delivered
      certificate this  15th day of September, 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: September 15, 1998   Due Period Ending: August 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:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     --------------------------------------------------------------------------
     Class Initial Investor Interest)
     --------------------------------
<TABLE>
<CAPTION>
        Series  1993-3                                    Total        Interest       Principal
<S>                        <C>                        <C>             <C>             <C>
              Class A      30 days at 6.200000000%    $5.166666667    $5.166666667    $0.000000000

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

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
<S>                                                          <C>
      (a) Aggregate Investor Interest                        $18,117,139,009.32
          Seller Interest                                     $5,596,919,006.55

          Total Master Trust                                 $23,714,058,015.87


      (b) Group One Investor Interest                        $15,567,139,009.32

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

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

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

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

3.   Allocation of Receivables Collected During the Due Period
     ---------------------------------------------------------
<TABLE>
<CAPTION>
                                                        Finance Charge       Principal             Yield
                                                         Collections        Collections         Collections

      (a) Allocation of Collections between Investor and Seller
<S>                                                   <C>               <C>                         <C>
          Aggregate Investor Allocation                $310,248,377.67   $2,465,220,139.53            $0.00

          Seller                                        $86,844,131.84     $690,059,701.17            $0.00

      (b) Group One Allocation                         $266,846,166.39   $2,120,348,052.94            $0.00

      (c) Group Two Allocation                          $43,402,211.28     $344,872,086.59            $0.00

      (d) Series 1993-3 Allocations                      $6,234,352.40      $49,537,893.50            $0.00

      (e) Class A Allocations                            $5,956,387.64      $47,329,197.61            $0.00

          Class B Allocations                              $277,964.76       $2,208,695.89            $0.00
</TABLE>



<PAGE>   2

4.   Information Concerning the Series Principal Funding Accounts ("SPFA")
     ---------------------------------------------------------------------
<TABLE>
<CAPTION>
                            Deposits into the
                               SPFAs This        SPFA      Deposit Deficit     Investment
                               Due Period       Balance        Amount            Income
<S>                               <C>           <C>             <C>              <C>
          Series 1993-3           $0.00         $0.00           0.00             $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments
     ----------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                      Total Payments
                                   Amount Paid       Deficit Amount    Through This
                                  This Due Period    This Due Period    Due Period
<S>                                     <C>              <C>               <C>
          Series 1993-3                 $0.00            $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")
     --------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                 Deposits Into the
                                                   SIFAs This
                                                   Due Period     SIFA Balance
<S>                                             <C>              <C>
          Series 1993-3                         $1,896,983.21    $7,587,932.84
</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                            $87,822,805.20            $0.00

      (b) Group Two                            $14,284,274.70            $0.00

      (c) Series 1993-3                         $2,051,812.56            $0.00

      (d) Class A                               $1,960,330.47            $0.00

          Class B                                  $91,482.09            $0.00
</TABLE>

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

      (b) Group Two                                     $0.00          $0.00

      (c) Series 1993-3                                 $0.00          $0.00

      (d) Class A                                       $0.00          $0.00

          Class B                                       $0.00          $0.00
</TABLE>



<PAGE>   3

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

      (b) Group Two                                   $0.00            $0.00

      (c) Series 1993-3                               $0.00            $0.00

      (d) Class A                                     $0.00            $0.00

          Class B                                     $0.00            $0.00
</TABLE>

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

      (b) Group Two                                   $0.00             $0.00

      (c) Series 1993-3                               $0.00             $0.00

      (d) Class A                                     $0.00             $0.00

          Class B                                     $0.00             $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period
     -------------------------------------------------------------------
<TABLE>
<S>                                                            <C>
      (a) Group One                                            $26,160,509.44

      (b) Group Two                                             $4,250,000.00

      (c) Series 1993-3                                           $610,821.66

      (d) Class A                                                 $583,333.33

          Class B                                                  $27,488.33
</TABLE>

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

14.  Total Available Credit Enhancement Amounts
     ------------------------------------------
<TABLE>
<CAPTION>
                                                     Shared Amount    Class B Amount
<S>                                                  <C>              <C>
          Maximum Amount                             $9,162,325.00    $5,497,395.00

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

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



<PAGE>   4

15.  Delinquency Summary
     -------------------

     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                              Delinquent Amount     Percentage of Ending
          Payment Status      Ending Balance       Receivables Outstanding
         <S>                 <C>                      <C>
          30-59 days           $637,811,902.88          2.65%

          60-179 days        $1,137,628,872.80          4.72%
</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 September 15, 1998:


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

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

      3.  The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                  $3,552,372,350.30     

      4.  The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                     $47,329,197.61

      5.  The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                               $5,956,387.64

      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                                                     $2,208,695.89

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                $277,964.76

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

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

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

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

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

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

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

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

          IN WITNESS WHEREOF, the undersigned has duly executed and delivered
      certificate this  15th day of September, 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: September 15, 1998   Due Period Ending: August 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:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     --------------------------------------------------------------------------
     Class Initial Investor Interest)
     --------------------------------
<TABLE>
<CAPTION>
   Series  1994-2                                  Total         Interest        Principal
   <S>              <C>                        <C>             <C>              <C>
       Class A      29 days at 5.990630000%    $4.825785278    $4.825785278     $0.000000000

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

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
      <S>                                                                 <C>
      (a) Aggregate Investor Interest                                     $18,117,139,009.32
          Seller Interest                                                  $5,596,919,006.55

          Total Master Trust                                              $23,714,058,015.87

      (b) Group One Investor Interest                                     $15,567,139,009.32

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

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

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

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

3.   Allocation of Receivables Collected During the Due Period
     ---------------------------------------------------------
<TABLE>
<CAPTION>
                                          Finance Charge         Principal          Yield
                                            Collections         Collections      Collections

      (a) Allocation of Collections between Investor and Seller
      <S>                                   <C>                <C>                     <C>
          Aggregate Investor Allocation     $310,248,377.67     $2,465,220,139.53      $0.00

          Seller                             $86,844,131.84       $690,059,701.17      $0.00

      (b) Group One Allocation              $266,846,166.39     $2,120,348,052.94      $0.00

      (c) Group Two Allocation               $43,402,211.28       $344,872,086.59      $0.00

      (d) Series 1994-2 Allocations          $15,208,643.11       $120,847,217.90      $0.00

      (e) Class A Allocations                $14,454,167.34       $114,852,186.20      $0.00

          Class B Allocations                   $754,475.77         $5,995,031.70      $0.00
</TABLE>


<PAGE>   2

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

5.   Information Concerning Amount of Controlled Liquidation Payments
     ----------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                   Total Payments
                                   Amount Paid    Deficit Amount   Through This
                                  This Due Period This Due Period   Due Period
          <S>                           <C>              <C>               <C>
          Series 1994-2                 $0.00            $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")
     --------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                 Deposits Into the
                                                   SIFAs This
                                                   Due Period       SIFA Balance
          <S>                                   <C>                      <C>
          Series 1994-2                         $4,402,028.20            $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                          $87,822,805.20                 $0.00

      (b) Group Two                          $14,284,274.70                 $0.00

      (c) Series 1994-2                       $5,005,377.14                 $0.00

      (d) Class A                             $4,757,068.61                 $0.00

          Class B                               $248,308.53                 $0.00
</TABLE>

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

      (b) Group Two                                     $0.00          $0.00

      (c) Series 1994-2                                 $0.00          $0.00

      (d) Class A                                       $0.00          $0.00

          Class B                                       $0.00          $0.00
</TABLE>


<PAGE>   3

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

      (b) Group Two                                     $0.00          $0.00

      (c) Series 1994-2                                 $0.00          $0.00

      (d) Class A                                       $0.00          $0.00

          Class B                                       $0.00          $0.00
</TABLE>

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

      (b) Group Two                                     $0.00          $0.00

      (c) Series 1994-2                                 $0.00          $0.00

      (d) Class A                                       $0.00          $0.00

          Class B                                       $0.00          $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period
     -------------------------------------------------------------------
<TABLE>
      <S>                                                      <C>
      (a) Group One                                            $26,160,509.44

      (b) Group Two                                             $4,250,000.00

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

      (d) Class A                                               $1,416,666.67

          Class B                                                  $74,561.67
</TABLE>

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

14.  Total Available Credit Enhancement Amounts
     ------------------------------------------
<TABLE>
<CAPTION>
                                                  Shared Amount  Class B Amount
          <S>                                     <C>            <C>
          Maximum Amount                                $0.00      $44,736,850.00

          Available Amount                              $0.00      $44,736,850.00

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


<PAGE>   4

15.  Delinquency Summary
     --------------------

     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                              Delinquent Amount  Percentage of Ending
          Payment Status      Ending Balance     Receivables Outstanding
          <S>              <C>                        <C>
          30-59 days         $637,811,902.88          2.65%

          60-179 days      $1,137,628,872.80          4.72%
</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 September 15, 1998:

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

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

      3.  The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                $3,552,372,350.30

      4.  The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                  $114,852,186.20

      5.  The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                            $14,454,167.34

      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                                          $4,101,917.49
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                              <C>
      9.  The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                     $5,995,031.70

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                $754,475.77

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

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

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

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

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

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

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

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

          IN WITNESS WHEREOF, the undersigned has duly executed and delivered
      certificate this  15th day of September, 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: September 15, 1998   Due Period Ending: August 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:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     --------------------------------------------------------------------------
     Class Initial Investor Interest)
     --------------------------------
<TABLE>
<CAPTION>
   Series  1994-3                                 Total          Interest          Principal
       <S>          <C>                      <C>               <C>              <C>
       Class A      29 days at 5.830630000%  $4.696896389      $4.696896389     $0.000000000

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

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
      <S>                                                                 <C>
      (a) Aggregate Investor Interest                                     $18,117,139,009.32
          Seller Interest                                                  $5,596,919,006.55

          Total Master Trust                                              $23,714,058,015.87


      (b) Group One Investor Interest                                     $15,567,139,009.32

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

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

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

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

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

          Aggregate Investor Allocation     $310,248,377.67      $2,465,220,139.53      $0.00

          Seller                             $86,844,131.84        $690,059,701.17      $0.00

      (b) Group One Allocation              $266,846,166.39      $2,120,348,052.94      $0.00

      (c) Group Two Allocation               $43,402,211.28        $344,872,086.59      $0.00

      (d) Series 1994-3 Allocations          $13,421,726.82        $106,648,458.62      $0.00

      (e) Class A Allocations                $12,746,669.56        $101,284,482.89      $0.00

          Class B Allocations                   $675,057.26          $5,363,975.73      $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 1994-3           $0.00         $0.00         0.00         $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments
     ----------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                  Total Payments
                                   Amount Paid    Deficit Amount   Through This
                                  This Due Period This Due Period   Due Period
          <S>                     <C>             <C>              <C>
          Series 1994-3                 $0.00            $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")
     --------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                 Deposits Into the
                                                   SIFAs This
                                                   Due Period     SIFA Balance
          <S>                                   <C>               <C>
          Series 1994-3                         $3,777,608.54            $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                        $87,822,805.20            $0.00

      (b) Group Two                        $14,284,274.70            $0.00

      (c) Series 1994-3                     $4,417,278.00            $0.00

      (d) Class A                           $4,195,107.21            $0.00

          Class B                             $222,170.79            $0.00
</TABLE>

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

      (b) Group Two                                $0.00          $0.00

      (c) Series 1994-3                            $0.00          $0.00

      (d) Class A                                  $0.00          $0.00

          Class B                                  $0.00          $0.00
</TABLE>


<PAGE>   3

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

      (b) Group Two                                     $0.00          $0.00

      (c) Series 1994-3                                 $0.00          $0.00

      (d) Class A                                       $0.00          $0.00

          Class B                                       $0.00          $0.00
</TABLE>

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

      (b) Group Two                                     $0.00          $0.00

      (c) Series 1994-3                                 $0.00          $0.00

      (d) Class A                                       $0.00          $0.00

          Class B                                       $0.00          $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period
     -------------------------------------------------------------------
<TABLE>
<CAPTION>
      <S>                                                     <C>
      (a) Group One                                            $26,160,509.44

      (b) Group Two                                             $4,250,000.00

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

      (d) Class A                                               $1,250,000.00

          Class B                                                  $65,790.00
</TABLE>

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

14.  Total Available Credit Enhancement Amounts
     ------------------------------------------
<TABLE>
<CAPTION>
                                                  Shared Amount  Class B Amount
          <S>                                     <C>            <C>
          Maximum Amount                                $0.00    $39,473,700.00

          Available Amount                              $0.00    $39,473,700.00

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


<PAGE>   4

15.  Delinquency Summary
     -------------------

     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                       Delinquent Amount  Percentage of Ending
    Payment Status      Ending Balance     Receivables Outstanding
    <S>              <C>                  <C>
    30-59 days         $637,811,902.88          2.65%

    60-179 days      $1,137,628,872.80          4.72%
</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 September 15, 1998:


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

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

      3.  The aggregate amount of Collections processed during the related Due
          Period is equal to                                                                 $3,552,372,350.30

      4.  The aggregate amount of Class A Principal Collections processed during
          the related Due Period is equal to                                                   $101,284,482.89

      5.  The aggregate amount of Class A Finance Charge Collections processed
          during the related Due Period is equal to                                             $12,746,669.56

      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                                           $3,522,672.29
</TABLE>


<PAGE>   6
<TABLE>
<S>                                                                                              <C>
      9.  The aggregate amount of Class B Principal Collections processed during
          the related Due Period is equal to                                                     $5,363,975.73

     10.  The aggregate amount of Class B Finance Charge Collections processed
          during the related Due Period is equal to                                                $675,057.26

     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  15th day of September, 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: September 15, 1998   Due Period Ending: August 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:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     --------------------------------------------------------------------------
     Class Initial Investor Interest)
     --------------------------------
<TABLE>
<CAPTION>
          Series  1994-A                                   Total          Interest        Principal
<S>                        <C>                         <C>            <C>               <C>
              Class A      30 days at 5.933743200%     $4.944786000   $4.944786000      $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
<S>                                                          <C>
      (a) Aggregate Investor Interest                        $18,117,139,009.32
          Seller Interest                                     $5,596,919,006.55

          Total Master Trust                                 $23,714,058,015.87


      (b) Group One Investor Interest                        $15,567,139,009.32

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

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

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

          Class B Investor Interest                                       $0.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period
     ---------------------------------------------------------
<TABLE>
<CAPTION>
                                                            Finance Charge           Principal           Yield
                                                             Collections            Collections        Collections

      (a) Allocation of Collections between Investor and Seller

<S>                                                        <C>                  <C>                     <C>
          Aggregate Investor Allocation                    $310,248,377.67      $2,465,220,139.53       $0.00

          Seller                                            $86,844,131.84        $690,059,701.17       $0.00

      (b) Group One Allocation                             $266,846,166.39      $2,120,348,052.94       $0.00

      (c) Group Two Allocation                              $43,402,211.28        $344,872,086.59       $0.00

      (d) Series 1994-A Allocations                         $43,402,211.28        $344,872,086.59       $0.00

      (e) Class A Allocations                               $43,402,211.28        $344,872,086.59       $0.00

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



<PAGE>   2


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

5.   Information Concerning Amount of Controlled Liquidation Payments
     ----------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                        Total Payments
                                   Amount Paid       Deficit Amount      Through This
                                  This Due Period   This Due Period       Due Period

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

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")
     --------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                 Deposits Into the
                                                   SIFAs This
                                                   Due Period         SIFA Balance

<S>                                             <C>                       <C>
          Series 1994-A                         $12,609,204.29            $0.00
</TABLE>

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

          Class B                                                 0.00000000
</TABLE>

8.   Investor Charged-Off Amount
     ---------------------------
<TABLE>
<CAPTION>
                                                                       Cumulative
                                                                       Investor
                                                                      Charged-Off
                                               This Due Period          Amount
<S>                                            <C>                       <C>
      (a) Group One                            $87,822,805.20            $0.00

      (b) Group Two                            $14,284,274.70            $0.00

      (c) Series 1994-A                        $14,284,274.70            $0.00

      (d) Class A                              $14,284,274.70            $0.00

          Class B                                       $0.00            $0.00
</TABLE>

9.   Investor Losses This Due Period
     -------------------------------
<TABLE>
<CAPTION>
                                                                    Per $1,000 of
                                                                  Original Invested
                                                        Total        Principal

<S>                                                     <C>            <C>
      (a) Group One                                     $0.00          $0.00

      (b) Group Two                                     $0.00          $0.00

      (c) Series 1994-A                                 $0.00          $0.00

      (d) Class A                                       $0.00          $0.00

          Class B                                       $0.00          $0.00
</TABLE>


<PAGE>   3

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

      (b) Group Two                                     $0.00          $0.00

      (c) Series 1994-A                                 $0.00          $0.00

      (d) Class A                                       $0.00          $0.00

          Class B                                       $0.00          $0.00
</TABLE>

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

      (b) Group Two                                     $0.00          $0.00

      (c) Series 1994-A                                 $0.00          $0.00

      (d) Class A                                       $0.00          $0.00

          Class B                                       $0.00          $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period
     -------------------------------------------------------------------
<TABLE>
<S>                                                            <C>
      (a) Group One                                            $26,160,509.44

      (b) Group Two                                             $4,250,000.00

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

      (d) Class A                                               $4,250,000.00

          Class B                                                       $0.00
</TABLE>

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

14.  Total Available Credit Enhancement Amounts
     ------------------------------------------
<TABLE>
<CAPTION>
                                                    Shared Amount         Class B Amount
<S>                                                <C>                        <C>
       Maximum Amount                              $204,000,000.00            $0.00

       Available Amount                            $204,000,000.00            $0.00

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



<PAGE>   4


15.  Delinquency Summary
     -------------------

     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                              Delinquent Amount    Percentage of Ending
          Payment Status      Ending Balance      Receivables Outstanding

          <S>              <C>                       <C>
          30-59 days          $637,811,902.88            2.65%

          60-179 days       $1,137,628,872.80            4.72%
</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 September 15, 1998:

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

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

3.  The aggregate amount of Collections processed during the related Due
    Period is equal to                                                               $3,552,372,350.30

4.  The aggregate amount of Class A Principal Collections processed during
    the related Due Period is equal to                                                 $344,872,086.59

5.  The aggregate amount of Class A Finance Charge Collections processed
    during the related Due Period is equal to                                           $43,402,211.28

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                                        $12,609,204.29

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

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

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

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


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

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of September, 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: September 15, 1998   Due Period Ending: August 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                            Total           Interest       Principal
     <S>          <C>                      <C>               <C>            <C>
     Class A      29 days at 5.920630000%  $4.769396389      $4.769396389   $0.000000000

     Class B      29 days at 6.090630000%  $4.906340833      $4.906340833   $0.000000000

</TABLE>

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
<S>                                                   <C>
(a)  Aggregate Investor Interest                      $18,117,139,009.32
     Seller Interest                                   $5,596,919,006.55
                                    
     Total Master Trust                               $23,714,058,015.87
                                    
(b)  Group One Investor Interest                      $15,567,139,009.32
                                    
(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

(a)  Allocation of Collections between Investor and Seller
<S>                                  <C>                   <C>                   <C>    
     Aggregate Investor Allocation   $310,248,377.67       $2,465,220,139.53       $0.00
                                                                                        
     Seller                           $86,844,131.84         $690,059,701.17       $0.00
                                                                                        
(b)  Group One Allocation            $266,846,166.39       $2,120,348,052.94       $0.00
                                                                                        
(c)  Group Two Allocation             $43,402,211.28         $344,872,086.59       $0.00
                                                                                        
(d)  Series 1995-1 Allocations        $10,761,207.01          $85,508,083.69       $0.00
                                                                                        
(e)  Class A Allocations              $10,205,277.50          $81,090,691.91       $0.00
                                                                                        
     Class B Allocations                 $555,929.51           $4,417,391.78       $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                       $3,016,575.17              $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                          $87,822,805.20              $0.00
                     
  (b)  Group Two                          $14,284,274.70              $0.00
                     
  (c)  Series 1995-1                       $3,541,663.72              $0.00
                     
  (d)  Class A                             $3,358,699.54              $0.00
                     
       Class B                               $182,964.18              $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 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                                          $26,160,509.44
                       
  (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

15.  Delinquency Summary
     -------------------

     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                      Delinquent Amount    Percentage of Ending
     Payment Status   Ending Balance       Receivables Outstanding
     <S>              <C>                        <C>
     30-59 days         $637,811,902.88          2.65%

     60-179 days      $1,137,628,872.80          4.72%

</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 September 15, 1998:

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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                              $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                                 $81,090,691.91

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                          $10,205,277.50

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

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

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

     (a)  with respect to the Class A Required Amount Shortfall                                  $0.00
          is equal to                                                  
                                                                       
     (b)  with respect to the Class A Cumulative Investor Charged-Off                            $0.00
          Amount is equal to                                           
                                                                       
     (c)  with respect to the Class A Investor Interest is equal to                              $0.00

 8.  The sum of all amounts payable to the Class A Certificateholders
     on the current Distribution Date is equal to                                        $2,861,637.83
</TABLE>
<PAGE>   6

<TABLE>
<S>                                                                                      <C>
 9.   The aggregate amount of Class B Principal Collections processed during 
      the related Due Period is equal to                                                 $4,417,391.78
                                                                             
10.   The aggregate amount of Class B Finance Charge Collections processed   
      during the related Due Period is equal to                                            $555,929.51

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                                         $154,937.34
                                                                                   
14.   Attached hereto is a true copy of the statement required to be delivered by  
      the Master Servicer on the date of this Certificate to the Trustee pursuant  
      to Section 16 of the Series Supplement.                                      
</TABLE>

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
 certificate this 15th day of September, 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: September 15, 1998  Due Period Ending:  August 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:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     --------------------------------------------------------------------------
     Class Initial Investor Interest)
     --------------------------------
<TABLE>
<CAPTION>
     Series  1995-2                                Total         Interest     Principal
         <S>          <C>                      <C>             <C>           <C>
         Class A      30 days at 6.550000000%  $5.458333333    $5.458333333  $0.000000000

         Class B      30 days at 6.750000000%  $5.625000000    $5.625000000  $0.000000000

</TABLE>

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
<S>                                                                   <C>
  (a)  Aggregate Investor Interest                                    $18,117,139,009.32
       Seller Interest                                                 $5,596,919,006.55
                                              
       Total Master Trust                                             $23,714,058,015.87
                                              
  (b)  Group One Investor Interest                                    $15,567,139,009.32
                                              
  (c)  Group Two Investor Interest                                     $2,550,000,000.00
                                              
  (d)  Series 1995-2 Investor Interest                                   $526,316,000.00
                                              
  (e)  Class A Investor Interest                                         $500,000,000.00
                                              
       Class B Investor Interest                                          $26,316,000.00

</TABLE>


3.   Allocation of Receivables Collected During the Due Period
     ---------------------------------------------------------
<TABLE>
<CAPTION>
                                                                 Finance Charge         Principal            Yield    
                                                                  Collections          Collections         Collections

  (a)  Allocation of Collections between Investor and Seller                                              
  <S>                                                             <C>                 <C>                     <C>    
       Aggregate Investor Allocation                              $310,248,377.67     $2,465,220,139.53         $0.00   
                                                                                                                          
       Seller                                                      $86,844,131.84       $690,059,701.17         $0.00     
                                                                                                                          
  (b)  Group One Allocation                                       $266,846,166.39     $2,120,348,052.94         $0.00     
                                                                                                                          
  (c)  Group Two Allocation                                        $43,402,211.28       $344,872,086.59         $0.00     
                                                                                                                          
  (d)  Series 1995-2 Allocations                                    $8,934,581.46        $70,993,796.41         $0.00     
                                                                                                                          
  (e)  Class A Allocations                                          $8,497,779.70        $67,522,988.59         $0.00     
                                                                                                                          
       Class B Allocations                                            $436,801.76         $3,470,807.82         $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       $2,877,194.17

</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                          $87,822,805.20            $0.00
                        
  (b)  Group Two                          $14,284,274.70            $0.00
                        
  (c)  Series 1995-2                       $2,940,495.71            $0.00
                        
  (d)  Class A                             $2,796,738.14            $0.00
                        
       Class B                               $143,757.57            $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                                          $26,160,509.44
                        
  (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   $24,108,720,721.41

                      Delinquent Amount    Percentage of Ending
     Payment Status   Ending Balance       Receivables Outstanding
     <S>              <C>                  <C>
     30-59 days         $637,811,902.88            2.65%

     60-179 days      $1,137,628,872.80            4.72%

</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 September 15, 1998:

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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                                 $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                                    $67,522,988.59

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                              $8,497,779.70

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

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

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

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

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

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

 8.  The sum of all amounts payable to the Class A Certificateholders
     on the current Distribution Date is equal to                                                   $0.00
</TABLE>
<PAGE>   6

<TABLE>
<S>                                                                                         <C>
 9.  The aggregate amount of Class B Principal Collections processed during
     the related Due Period is equal to                                                     $3,470,807.82

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                                $436,801.76

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

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

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

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

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

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

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

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

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
 certificate this  15th day of September, 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: September 15, 1998   Due Period Ending: August 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:

1. Payments for the benefit of Series Investors this Due Period (per $1000 of
   --------------------------------------------------------------------------
   Class Initial Investor Interest)
   --------------------------------
<TABLE>
<CAPTION>
     Series  1995-3                               Total           Interest     Principal
         <S>          <C>                      <C>             <C>           <C>         
         Class A      29 days at 5.850630000%  $4.713007500    $4.713007500  $0.000000000

         Class B      29 days at 5.970630000%  $4.809674167    $4.809674167  $0.000000000

</TABLE>

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
<S>                                                     <C>               
  (a)  Aggregate Investor Interest                      $18,117,139,009.32
       Seller Interest                                   $5,596,919,006.55
                                            
       Total Master Trust                               $23,714,058,015.87
                                            
  (b)  Group One Investor Interest                      $15,567,139,009.32
                                            
  (c)  Group Two Investor Interest                       $2,550,000,000.00
                                            
  (d)  Series 1995-3 Investor Interest                     $526,316,000.00
                                            
  (e)  Class A Investor Interest                           $500,000,000.00
                                            
       Class B Investor Interest                            $26,316,000.00

</TABLE>
3.   Allocation of Receivables Collected During the Due Period
     ---------------------------------------------------------
<TABLE>
<CAPTION>
                                                                  Finance Charge          Principal           Yield      
                                                                   Collections           Collections       Collections

  (a)  Allocation of Collections between Investor and Seller
<S>                                                               <C>                   <C>                     <C>  
       Aggregate Investor Allocation                              $310,248,377.67       $2,465,220,139.53       $0.00
                                                                                                                     
       Seller                                                      $86,844,131.84         $690,059,701.17       $0.00
                                                                                                                     
  (b)  Group One Allocation                                       $266,846,166.39       $2,120,348,052.94       $0.00
                                                                                                                     
  (c)  Group Two Allocation                                        $43,402,211.28         $344,872,086.59       $0.00
                                                                                                                     
  (d)  Series 1995-3 Allocations                                    $8,934,581.46          $70,993,796.41       $0.00
                                                                                                                     
  (e)  Class A Allocations                                          $8,497,779.70          $67,522,988.59       $0.00
                                                                                                                     
       Class B Allocations                                            $436,801.76           $3,470,807.82       $0.00
</TABLE>
<PAGE>   2

4.   Information Concerning the Series Principal Funding Accounts ("SPFA")
     ---------------------------------------------------------------------
<TABLE>
<CAPTION>
                         Deposits into the
                          SPFAs This        SPFA    Deposit Deficit Investment
                          Due Period       Balance    Amount         Income
     <S>                     <C>           <C>           <C>          <C>          
     Series 1995-3           $0.00         $0.00         0.00         $0.00
</TABLE>

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

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")
     --------------------------------------------------------------------
<TABLE>
<CAPTION>
                                            Deposits Into the
                                              SIFAs This
                                              Due Period       SIFA Balance
     <S>                                   <C>                 <C>  
     Series 1995-3                         $2,483,075.14            $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                          $87,822,805.20            $0.00
                        
  (b)  Group Two                          $14,284,274.70            $0.00
                        
  (c)  Series 1995-3                       $2,940,495.71            $0.00
                        
  (d)  Class A                             $2,796,738.14            $0.00
                        
       Class B                               $143,757.57            $0.00

</TABLE>
9.   Investor Losses This Due Period
     -------------------------------
<TABLE>
<CAPTION>
                                                             Per $1,000 of
                                                            Original Invested
                                                   Total       Principal
<S>                                                <C>            <C>  
  (a)  Group One                                   $0.00          $0.00
                        
  (b)  Group Two                                   $0.00          $0.00
                        
  (c)  Series 1995-3                               $0.00          $0.00
                        
  (d)  Class A                                     $0.00          $0.00
                        
       Class B                                     $0.00          $0.00
</TABLE>
<PAGE>   3


10.  Reimbursement of Investor Losses This Due Period 
     ------------------------------------------------
<TABLE>
<CAPTION>
                                                             Per $1,000 of
                                                            Original Invested
                                                   Total      Principal
<S>                                                <C>            <C>  
  (a)  Group One                                   $0.00          $0.00
                      
  (b)  Group Two                                   $0.00          $0.00
                      
  (c)  Series 1995-3                               $0.00          $0.00
                      
  (d)  Class A                                     $0.00          $0.00
                      
       Class B                                     $0.00          $0.00
</TABLE>

11.  Aggregate Amount of Unreimbursed Investor Losses        
     ------------------------------------------------
<TABLE>
<CAPTION>
                                                              Per $1,000 of
                                                            Original Invested
                                                   Total        Principal
  <S>                                              <C>            <C>  
  (a)  Group One                                   $0.00          $0.00
                                 
  (b)  Group Two                                   $0.00          $0.00
                                 
  (c)  Series 1995-3                               $0.00          $0.00
                                 
  (d)  Class A                                     $0.00          $0.00
                                 
       Class B                                     $0.00          $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period
     -------------------------------------------------------------------
<TABLE>
<S>                                                       <C>           
  (a)  Group One                                          $26,160,509.44
                     
  (b)  Group Two                                           $4,250,000.00
                     
  (c)  Series 1995-3                                         $877,193.33
                     
  (d)  Class A                                               $833,333.33
                     
       Class B                                                $43,860.00
</TABLE>

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

</TABLE>
14.  Total Available Credit Enhancement Amounts
     ------------------------------------------
<TABLE>
<CAPTION>
                                             Shared Amount  Class B Amount
<S>                                          <C>           <C>           
     Maximum Amount                                $0.00   $31,578,960.00

     Available Amount                              $0.00   $31,578,960.00

     Amount of Drawings on Credit Enhancement
       for this Due Period                         $0.00            $0.00
</TABLE>
<PAGE>   4

15.  Delinquency Summary
     -------------------

     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                         Delinquent Amount  Percentage of Ending
     Payment Status      Ending Balance     Receivables Outstanding
     <S>              <C>                        <C>  
     30-59 days         $637,811,902.88          2.65%

     60-179 days      $1,137,628,872.80          4.72%
</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 September 15, 1998:


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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                         $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                            $67,522,988.59

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                      $8,497,779.70

 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                                   $2,356,503.75
</TABLE>
<PAGE>   6

<TABLE>
<S>                                                                                 <C>
 9.  The aggregate amount of Class B Principal Collections processed during
     the related Due Period is equal to                                             $3,470,807.82

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                        $436,801.76

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

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

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

     (a)  with respect to the Class B Required Amount Shortfall                             $0.00
          is equal to                                                   
                                                                        
     (b)  with respect to the Class B Cumulative Investor Charged-Off                       $0.00
          Amount is equal to                                            
                                                                        
     (c)  with respect to the Class B Investor Interest is equal to                         $0.00

13.  The sum of all amounts payable to the Class B Certificateholders
     on the current Distribution Date is equal to                                     $126,571.39

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 15th day of September, 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: September 15, 1998   Due Period Ending: August 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:

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

<TABLE>
<CAPTION>
     Series  1996-1                               Total             Interest     Principal
         <S>          <C>                      <C>               <C>           <C>         
         Class A      29 days at 5.810630000%  $4.680785278      $4.680785278  $0.000000000

         Class B      29 days at 5.940630000%  $4.785507500      $4.785507500  $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------

<TABLE>
<S>                                                     <C>               
  (a)  Aggregate Investor Interest                      $18,117,139,009.32
       Seller Interest                                   $5,596,919,006.55
                                       
       Total Master Trust                               $23,714,058,015.87
                                       
  (b)  Group One Investor Interest                      $15,567,139,009.32
                                       
  (c)  Group Two Investor Interest                       $2,550,000,000.00
                                       
  (d)  Series 1996-1 Investor Interest                   $1,052,632,000.00
                                       
  (e)  Class A Investor Interest                         $1,000,000,000.00
                                       
       Class B Investor Interest                            $52,632,000.00
</TABLE>

3.   Allocation of Receivables Collected During the Due Period
     ---------------------------------------------------------
<TABLE>
<CAPTION>
                                                                  Finance Charge         Principal                Yield    
                                                                   Collections          Collections            Collections
                                                      
  (a)  Allocation of Collections between Investor and Seller
<S>                                                              <C>                <C>                          <C>  
       Aggregate Investor Allocation                             $310,248,377.67    $2,465,220,139.53            $0.00
                                                                                                                      
       Seller                                                     $86,844,131.84      $690,059,701.17            $0.00
                                                                                                                      
  (b)  Group One Allocation                                      $266,846,166.39    $2,120,348,052.94            $0.00
                                                                                                                      
  (c)  Group Two Allocation                                       $43,402,211.28      $344,872,086.59            $0.00
                                                                                                                      
  (d)  Series 1996-1 Allocations                                  $17,908,872.18      $142,303,120.81            $0.00
                                                                                                                      
  (e)  Class A Allocations                                        $16,995,559.41      $135,045,977.18            $0.00
                                                                                                                      
       Class B Allocations                                           $913,312.77        $7,257,143.63            $0.00
</TABLE>
<PAGE>   2
4.   Information Concerning the Series Principal Funding Accounts ("SPFA")
     ---------------------------------------------------------------------

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

5.   Information Concerning Amount of Controlled Liquidation Payments
     ----------------------------------------------------------------

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

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")
     --------------------------------------------------------------------
<TABLE>
<CAPTION>
                                            Deposits Into the
                                              SIFAs This
                                              Due Period       SIFA Balance
     <S>                                   <C>                        <C>  
     Series 1996-1                         $4,932,656.11              $0.00
</TABLE>

7.   Pool Factors
     ------------
<TABLE>
<CAPTION>
                                                            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                          $87,822,805.20            $0.00
                        
  (b)  Group Two                          $14,284,274.70            $0.00
                        
  (c)  Series 1996-1                       $5,894,060.29            $0.00
                        
  (d)  Class A                             $5,593,476.28            $0.00
                        
       Class B                               $300,584.01            $0.00
</TABLE>

9.   Investor Losses This Due Period
     -------------------------------

<TABLE>
<CAPTION>
                                                             Per $1,000 of
                                                            Original Invested
                                                   Total      Principal
<S>                                                <C>            <C>  
  (a)  Group One                                   $0.00          $0.00
                       
  (b)  Group Two                                   $0.00          $0.00
                       
  (c)  Series 1996-1                               $0.00          $0.00
                       
  (d)  Class A                                     $0.00          $0.00
                       
       Class B                                     $0.00          $0.00
</TABLE>


<PAGE>   3
10.  Reimbursement of Investor Losses This Due Period
     ------------------------------------------------
<TABLE>
<CAPTION>
                                                             Per $1,000 of
                                                            Original Invested
                                                   Total       Principal
<S>                                                <C>      <C>  
  (a)  Group One                                   $0.00          $0.00
                      
  (b)  Group Two                                   $0.00          $0.00
                      
  (c)  Series 1996-1                               $0.00          $0.00
                      
  (d)  Class A                                     $0.00          $0.00
                      
       Class B                                     $0.00          $0.00

</TABLE>

<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>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period
     -------------------------------------------------------------------
<TABLE>
<S>                                                       <C>           
  (a)  Group One                                          $26,160,509.44
                              
  (b)  Group Two                                           $4,250,000.00
                              
  (c)  Series 1996-1                                       $1,754,386.67
                              
  (d)  Class A                                             $1,666,666.67
                              
       Class B                                                $87,720.00
</TABLE>

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

14.  Total Available Credit Enhancement Amounts
     ------------------------------------------
<TABLE>
<CAPTION>
                                             Shared Amount  Class B Amount
<S>                                                <C>     <C>           
     Maximum Amount                                $0.00   $57,894,760.00

     Available Amount                              $0.00   $57,894,760.00

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

<PAGE>   4

15.  Delinquency Summary
     -------------------

     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                      Delinquent Amount    Percentage of Ending
     Payment Status   Ending Balance       Receivables Outstanding
     <S>                <C>                      <C>  
     30-59 days         $637,811,902.88          2.65%

     60-179 days      $1,137,628,872.80          4.72%

</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 September 15, 1998:


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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                             $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                               $135,045,977.18

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                         $16,995,559.41

 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                                       $4,680,785.28
</TABLE>
<PAGE>   6

<TABLE>
<S>                                                                                     <C>
 9.  The aggregate amount of Class B Principal Collections processed during
     the related Due Period is equal to                                                 $7,257,143.63

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                            $913,312.77

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                                         $251,870.83

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

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
 certificate this 15th day of September, 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: September 15, 1998   Due Period Ending: August 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:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     --------------------------------------------------------------------------
     Class Initial Investor Interest)
     --------------------------------
<TABLE>
<CAPTION>
     Series  1996-2                               Total             Interest     Principal
         <S>          <C>                      <C>               <C>           <C>         
         Class A      29 days at 5.860630000%  $4.721063056      $4.721063056  $0.000000000

         Class B      29 days at 6.000630000%  $4.833840833      $4.833840833  $0.000000000

</TABLE>
2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------

<TABLE>
<S>                                                     <C>               
  (a)  Aggregate Investor Interest                      $18,117,139,009.32
       Seller Interest                                   $5,596,919,006.55
                                           
       Total Master Trust                               $23,714,058,015.87
                                           
  (b)  Group One Investor Interest                      $15,567,139,009.32
                                           
  (c)  Group Two Investor Interest                       $2,550,000,000.00
                                           
  (d)  Series 1996-2 Investor Interest                     $947,369,000.00
                                           
  (e)  Class A Investor Interest                           $900,000,000.00
                                           
       Class B Investor Interest                            $47,369,000.00

</TABLE>
3.   Allocation of Receivables Collected During the Due Period
     ---------------------------------------------------------
<TABLE>
<CAPTION>
                                                                   Finance Charge           Principal               Yield    
                                                                    Collections            Collections            Collections
                                                      
  (a)  Allocation of Collections between Investor and Seller
  <S>                                                               <C>                  <C>                          <C>  
       Aggregate Investor Allocation                                $310,248,377.67      $2,465,220,139.53            $0.00
                                                                                                                           
       Seller                                                        $86,844,131.84        $690,059,701.17            $0.00
                                                                                                                           
  (b)  Group One Allocation                                         $266,846,166.39      $2,120,348,052.94            $0.00
                                                                                                                           
  (c)  Group Two Allocation                                          $43,402,211.28        $344,872,086.59            $0.00
                                                                                                                           
  (d)  Series 1996-2 Allocations                                     $16,082,246.64        $127,788,833.55            $0.00
                                                                                                                           
  (e)  Class A Allocations                                           $15,288,061.62        $121,478,273.87            $0.00
                                                                                                                           
       Class B Allocations                                              $794,185.02          $6,310,559.68            $0.00
</TABLE>
<PAGE>   2


4.   Information Concerning the Series Principal Funding Accounts ("SPFA")
     ---------------------------------------------------------------------
<TABLE>
<CAPTION>
                         Deposits into the
                          SPFAs This         SPFA    Deposit Deficit Investment
                          Due Period        Balance    Amount         Income
     <S>                     <C>            <C>           <C>          <C>  
     Series 1996-2           $0.00          $0.00         0.00         $0.00

</TABLE>
5.   Information Concerning Amount of Controlled Liquidation Payments
     ----------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                Total Payments
                              Amount Paid      Deficit Amount   Through This
                             This Due Period   This Due Period   Due Period
     <S>                           <C>              <C>               <C>  
     Series 1996-2                 $0.00            $0.00             $0.00

</TABLE>
6.   Information Concerning the Series Interest Funding Accounts ("SIFA")
     --------------------------------------------------------------------
<TABLE>
<CAPTION>
                                            Deposits Into the
                                              SIFAs This
                                              Due Period      SIFA Balance
     <S>                                   <C>                      <C>  
     Series 1996-2                         $4,477,930.96            $0.00

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

     Class B                                                 1.00000000

</TABLE>
8.   Investor Charged-Off Amount
     ---------------------------
<TABLE>
<CAPTION>
                                                              Cumulative
                                                           Investor Charged-Off
                                         This Due Period        Amount
  <S>                                     <C>                       <C>  
  (a)  Group One                          $87,822,805.20            $0.00
                         
  (b)  Group Two                          $14,284,274.70            $0.00
                         
  (c)  Series 1996-2                       $5,292,892.28            $0.00
                         
  (d)  Class A                             $5,031,514.88            $0.00
                         
       Class B                               $261,377.40            $0.00

</TABLE>
9.   Investor Losses This Due Period
     -------------------------------
<TABLE>
<CAPTION>
                                                             Per $1,000 of
                                                            Original Invested
                                                    Total      Principal
  <S>                                              <C>            <C>  
  (a)  Group One                                   $0.00          $0.00
                        
  (b)  Group Two                                   $0.00          $0.00
                        
  (c)  Series 1996-2                               $0.00          $0.00
                        
  (d)  Class A                                     $0.00          $0.00
                        
       Class B                                     $0.00          $0.00
</TABLE>

<PAGE>   3


10.  Reimbursement of Investor Losses This Due Period
     ------------------------------------------------
<TABLE>
<CAPTION>
                                                              Per $1,000 of
                                                            Original Invested
                                                 Total          Principal
  <S>                                              <C>            <C>  
  (a)  Group One                                   $0.00          $0.00
                         
  (b)  Group Two                                   $0.00          $0.00
                         
  (c)  Series 1996-2                               $0.00          $0.00
                         
  (d)  Class A                                     $0.00          $0.00
                         
       Class B                                     $0.00          $0.00

</TABLE>
11.  Aggregate Amount of Unreimbursed Investor Losses
     ------------------------------------------------
<TABLE>
<CAPTION>
                                                              Per $1,000 of
                                                            Original Invested
                                                   Total        Principal
  <S>                                              <C>            <C>  
  (a)  Group One                                   $0.00          $0.00
                       
  (b)  Group Two                                   $0.00          $0.00
                       
  (c)  Series 1996-2                               $0.00          $0.00
                       
  (d)  Class A                                     $0.00          $0.00
                       
       Class B                                     $0.00          $0.00
</TABLE>

12.  Investor Monthly Servicing Fee Payable at the end of the Due Period
     -------------------------------------------------------------------
<TABLE>
<S>                                                       <C>           
  (a)  Group One                                          $26,160,509.44
                         
  (b)  Group Two                                           $4,250,000.00
                         
  (c)  Series 1996-2                                       $1,578,948.33
                         
  (d)  Class A                                             $1,500,000.00
                         
       Class B                                                $78,948.33

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

</TABLE>
14.  Total Available Credit Enhancement Amounts
     ------------------------------------------
<TABLE>
<CAPTION>
                                             Shared Amount  Class B Amount
     <S>                                           <C>     <C>           
     Maximum Amount                                $0.00   $56,842,140.00

     Available Amount                              $0.00   $56,842,140.00

     Amount of Drawings on Credit Enhancement
       for this Due Period                         $0.00            $0.00
</TABLE>
<PAGE>   4


15.  Delinquency Summary
     -------------------

     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41
<TABLE>
<CAPTION>
                      Delinquent Amount    Percentage of Ending
     Payment Status   Ending Balance       Receivables Outstanding
     <S>              <C>                        <C>  
     30-59 days         $637,811,902.88          2.65%

     60-179 days      $1,137,628,872.80          4.72%
</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 September 15, 1998:


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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                            $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                              $121,478,273.87

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                        $15,288,061.62

 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                                      $4,248,956.75
</TABLE>
<PAGE>   6
<TABLE>
<S>                                                                                    <C>
 9.  The aggregate amount of Class B Principal Collections processed during
     the related Due Period is equal to                                                $6,310,559.68

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                           $794,185.02

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                                        $228,974.21

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

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
 certificate this  15th day of September, 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: September 15, 1998   Due Period Ending: August 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:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     --------------------------------------------------------------------------
     Class Initial Investor Interest)
     --------------------------------
<TABLE>
<CAPTION>
     Series  1996-3                               Total             Interest     Principal
         <S>          <C>                      <C>               <C>           <C>         
         Class A      30 days at 6.050000000%  $5.041666667      $5.041666667  $0.000000000

         Class B      30 days at 6.250000000%  $5.208333333      $5.208333333  $0.000000000

</TABLE>

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
<S>                                                     <C>               
  (a)  Aggregate Investor Interest                      $18,117,139,009.32
       Seller Interest                                   $5,596,919,006.55
                                         
       Total Master Trust                               $23,714,058,015.87
                                         
  (b)  Group One Investor Interest                      $15,567,139,009.32
                                         
  (c)  Group Two Investor Interest                       $2,550,000,000.00
                                         
  (d)  Series 1996-3 Investor Interest                     $631,579,000.00
                                         
  (e)  Class A Investor Interest                           $600,000,000.00
                                         
       Class B Investor Interest                            $31,579,000.00

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

                                                                        Finance Charge            Principal                 Yield
                                                                         Collections             Collections             Collections

  (a)  Allocation of Collections between Investor and Seller
<S>                                                                    <C>                   <C>                          <C>  
       Aggregate Investor Allocation                                   $310,248,377.67       $2,465,220,139.53            $0.00
                                                            
       Seller                                                           $86,844,131.84         $690,059,701.17            $0.00
                                                            
  (b)  Group One Allocation                                            $266,846,166.39       $2,120,348,052.94            $0.00
                                                            
  (c)  Group Two Allocation                                             $43,402,211.28         $344,872,086.59            $0.00
                                                            
  (d)  Series 1996-3 Allocations                                        $10,761,207.01          $85,508,083.69            $0.00
                                                            
  (e)  Class A Allocations                                              $10,205,277.50          $81,090,691.91            $0.00
                                                            
       Class B Allocations                                                 $555,929.51           $4,417,391.78            $0.00
</TABLE>
<PAGE>   2

4.   Information Concerning the Series Principal Funding Accounts ("SPFA")
     ---------------------------------------------------------------------
<TABLE>
<CAPTION>
                         Deposits into the
                          SPFAs This          SPFA    Deposit Deficit Investment
                          Due Period         Balance    Amount         Income
     <S>                     <C>             <C>           <C>          <C>  
     Series 1996-3           $0.00           $0.00         0.00         $0.00

</TABLE>
5.   Information Concerning Amount of Controlled Liquidation Payments
     ----------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                Total Payments
                              Amount Paid      Deficit Amount   Through This
                             This Due Period   This Due Period   Due Period
     <S>                           <C>              <C>               <C>  
     Series 1996-3                 $0.00            $0.00             $0.00

</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")
     --------------------------------------------------------------------
<TABLE>
<CAPTION>
                                            Deposits Into the
                                              SIFAs This
                                              Due Period       SIFA Balance
     <S>                                   <C>                <C>          
     Series 1996-3                         $3,189,473.96      $3,189,473.96

</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                          $87,822,805.20            $0.00
                       
  (b)  Group Two                          $14,284,274.70            $0.00
                       
  (c)  Series 1996-3                       $3,541,663.72            $0.00
                       
  (d)  Class A                             $3,358,699.54            $0.00
                       
       Class B                               $182,964.18            $0.00

</TABLE>
9.   Investor Losses This Due Period
     -------------------------------
<TABLE>
<CAPTION>
                                                             Per $1,000 of
                                                            Original Invested
                                                   Total        Principal
  <S>                                              <C>            <C>  
  (a)  Group One                                   $0.00          $0.00
                       
  (b)  Group Two                                   $0.00          $0.00
                       
  (c)  Series 1996-3                               $0.00          $0.00
                       
  (d)  Class A                                     $0.00          $0.00
                       
       Class B                                     $0.00          $0.00
</TABLE>

<PAGE>   3


10.  Reimbursement of Investor Losses This Due Period
     ------------------------------------------------
<TABLE>
<CAPTION>
                                                              Per $1,000 of
                                                            Original Invested
                                                   Total        Principal
  <S>                                              <C>            <C>  
  (a)  Group One                                   $0.00          $0.00
                        
  (b)  Group Two                                   $0.00          $0.00
                        
  (c)  Series 1996-3                               $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 1996-3                               $0.00          $0.00
                         
  (d)  Class A                                     $0.00          $0.00
                         
       Class B                                     $0.00          $0.00

</TABLE>
12.  Investor Monthly Servicing Fee Payable at the end of the Due Period
     -------------------------------------------------------------------
<TABLE>
  <S>                                                     <C>           
  (a)  Group One                                          $26,160,509.44
                       
  (b)  Group Two                                           $4,250,000.00
                       
  (c)  Series 1996-3                                       $1,052,631.67
                       
  (d)  Class A                                             $1,000,000.00
                       
       Class B                                                $52,631.67

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

</TABLE>
14.  Total Available Credit Enhancement Amounts
     ------------------------------------------
<TABLE>
<CAPTION>
                                             Shared Amount  Class B Amount
     <S>                                           <C>     <C>           
     Maximum Amount                                $0.00   $18,947,370.00

     Available Amount                              $0.00   $18,947,370.00

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

<PAGE>   4

15.  Delinquency Summary
     -------------------

     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                      Delinquent Amount   Percentage of Ending
     Payment Status   Ending Balance      Receivables Outstanding
     <S>              <C>                        <C>  
     30-59 days         $637,811,902.88          2.65%

     60-179 days      $1,137,628,872.80          4.72%

</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 September 15, 1998:


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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                             $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                                $81,090,691.91

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                         $10,205,277.50

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

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

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

     (a)  with respect to the Class A Required Amount Shortfall                                 $0.00
          is equal to                                                    
                                                                         
     (b)  with respect to the Class A Cumulative Investor Charged-Off                           $0.00
          Amount is equal to                                             
                                                                         
     (c)  with respect to the Class A Investor Interest is equal to                             $0.00

 8.  The sum of all amounts payable to the Class A Certificateholders
     on the current Distribution Date is equal to                                               $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                                                 $4,417,391.78

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                            $555,929.51

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

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

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

     (a)  with respect to the Class B Required Amount Shortfall                                 $0.00
          is equal to                                                  
                                                                       
     (b)  with respect to the Class B Cumulative Investor Charged-Off                           $0.00
          Amount is equal to                                           
                                                                       
     (c)  with respect to the Class B Investor Interest is equal to                             $0.00

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

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

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
 certificate this  15th day of September, 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: September 15, 1998   Due Period Ending: August 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:

1.   Payments for the benefit of Series Investors this Due Period (per $1000 of
     --------------------------------------------------------------------------
     Class Initial Investor Interest)
     --------------------------------
<TABLE>
<CAPTION>
     Series  1996-4                               Total             Interest     Principal
         <S>          <C>                      <C>               <C>           <C>         
         Class A      29 days at 6.015630000%  $4.845924167      $4.845924167  $0.000000000

         Class B      29 days at 6.190630000%  $4.986896389      $4.986896389  $0.000000000

</TABLE>
2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
<S>                                                     <C>               
  (a)  Aggregate Investor Interest                      $18,117,139,009.32
       Seller Interest                                   $5,596,919,006.55
                                           
       Total Master Trust                               $23,714,058,015.87
                                           
  (b)  Group One Investor Interest                      $15,567,139,009.32
                                           
  (c)  Group Two Investor Interest                       $2,550,000,000.00
                                           
  (d)  Series 1996-4 Investor Interest                   $1,052,632,000.00
                                           
  (e)  Class A Investor Interest                         $1,000,000,000.00
                                           
       Class B Investor Interest                            $52,632,000.00

</TABLE>
3.   Allocation of Receivables Collected During the Due Period
     ---------------------------------------------------------
<TABLE>
<CAPTION>
                                                                  Finance Charge         Principal               Yield
                                                                    Collections         Collections           Collections

  (a)  Allocation of Collections between Investor and Seller
  <S>                                                             <C>                <C>                          <C>  
       Aggregate Investor Allocation                              $310,248,377.67    $2,465,220,139.53            $0.00
                                                            
       Seller                                                      $86,844,131.84      $690,059,701.17            $0.00
                                                            
  (b)  Group One Allocation                                       $266,846,166.39    $2,120,348,052.94            $0.00
                                                            
  (c)  Group Two Allocation                                        $43,402,211.28      $344,872,086.59            $0.00
                                                            
  (d)  Series 1996-4 Allocations                                   $17,908,872.18      $142,303,120.81            $0.00
                                                            
  (e)  Class A Allocations                                         $16,995,559.41      $135,045,977.18            $0.00
                                                            
       Class B Allocations                                            $913,312.77        $7,257,143.63            $0.00
</TABLE>
<PAGE>   2


4.   Information Concerning the Series Principal Funding Accounts ("SPFA")
     ---------------------------------------------------------------------
<TABLE>
<CAPTION>
                         Deposits into the
                          SPFAs This          SPFA    Deposit Deficit Investment
                          Due Period         Balance    Amount         Income
     <S>                     <C>             <C>           <C>          <C>  
     Series 1996-4           $0.00           $0.00         0.00         $0.00

</TABLE>
5.   Information Concerning Amount of Controlled Liquidation Payments
     ----------------------------------------------------------------
<TABLE>
<CAPTION>
                                                              Total Payments
                              Amount Paid    Deficit Amount   Through This
                            This Due Period  This Due Period   Due Period
     <S>                           <C>              <C>               <C>  
     Series 1996-4                 $0.00            $0.00             $0.00

</TABLE>
6.   Information Concerning the Series Interest Funding Accounts ("SIFA") 
     --------------------------------------------------------------------
<TABLE>
<CAPTION>
                                            Deposits Into the
                                              SIFAs This
                                              Due Period       SIFA Balance
     <S>                                   <C>                      <C>  
     Series 1996-4                         $5,108,394.50            $0.00

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

     Class B                                                 1.00000000

</TABLE>
8.   Investor Charged-Off Amount
     ---------------------------
<TABLE>
<CAPTION>
                                                              Cumulative
                                                           Investor Charged-Off
                                         This Due Period        Amount
  <S>                                     <C>                       <C>  
  (a)  Group One                          $87,822,805.20            $0.00
                      
  (b)  Group Two                          $14,284,274.70            $0.00
                      
  (c)  Series 1996-4                       $5,894,060.29            $0.00
                      
  (d)  Class A                             $5,593,476.28            $0.00
                      
       Class B                               $300,584.01            $0.00

</TABLE>
9.   Investor Losses This Due Period
     -------------------------------
<TABLE>
<CAPTION>
                                                             Per $1,000 of
                                                            Original Invested
                                                   Total        Principal
  <S>                                              <C>            <C>  
  (a)  Group One                                   $0.00          $0.00
                      
  (b)  Group Two                                   $0.00          $0.00
                      
  (c)  Series 1996-4                               $0.00          $0.00
                      
  (d)  Class A                                     $0.00          $0.00
                      
       Class B                                     $0.00          $0.00
</TABLE>
<PAGE>   3


10.  Reimbursement of Investor Losses This Due Period
     ------------------------------------------------
<TABLE>
<CAPTION>
                                                              Per $1,000 of
                                                            Original Invested
                                                   Total        Principal
  <S>                                              <C>            <C>  
  (a)  Group One                                   $0.00          $0.00
                      
  (b)  Group Two                                   $0.00          $0.00
                      
  (c)  Series 1996-4                               $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 1996-4                               $0.00          $0.00
                       
  (d)  Class A                                     $0.00          $0.00
                       
       Class B                                     $0.00          $0.00

</TABLE>
12.  Investor Monthly Servicing Fee Payable at the end of the Due Period
     -------------------------------------------------------------------
<TABLE>
<S>                                                       <C>           
  (a)  Group One                                          $26,160,509.44
                              
  (b)  Group Two                                           $4,250,000.00
                              
  (c)  Series 1996-4                                       $1,754,386.67
                              
  (d)  Class A                                             $1,666,666.67
                              
       Class B                                                $87,720.00

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

</TABLE>
14.  Total Available Credit Enhancement Amounts
     ------------------------------------------
<TABLE>
<CAPTION>
                                             Shared Amount  Class B Amount
     <S>                                           <C>     <C>           
     Maximum Amount                                $0.00   $63,157,920.00

     Available Amount                              $0.00   $63,157,920.00

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

<PAGE>   4

15.  Delinquency Summary
     -------------------

     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                      Delinquent Amount  Percentage of Ending
     Payment Status   Ending Balance     Receivables Outstanding
     <S>              <C>                        <C>  
     30-59 days         $637,811,902.88          2.65%

     60-179 days      $1,137,628,872.80          4.72%

</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 September 15, 1998:


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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                           $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                             $135,045,977.18

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                       $16,995,559.41

 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                                     $4,845,924.17
</TABLE>
<PAGE>   6

<TABLE>
<S>                                                                                   <C>
 9.  The aggregate amount of Class B Principal Collections processed during
     the related Due Period is equal to                                               $7,257,143.63

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                          $913,312.77

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                                       $262,470.33

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

     IN WITNESS WHEREOF, the undersigned has duly executed and delivered
 certificate this  15th day of September, 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: September 15, 1998   Due Period Ending: August 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>           <C>
         Class A      29 days at 5.730630000%  $4.616340833  $4.616340833  $0.000000000

         Class B      29 days at 5.910630000%  $4.761340833  $4.761340833  $0.000000000

</TABLE>

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
     <S>                                                     <C>
     (a)  Aggregate Investor Interest                        $18,117,139,009.32
          Seller Interest                                     $5,596,919,006.55

          Total Master Trust                                 $23,714,058,015.87


     (b)  Group One Investor Interest                        $15,567,139,009.32

     (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.      $310,248,377.67      $2,465,220,139.53        $0.00

          Seller:                              $86,844,131.84        $690,059,701.17        $0.00

     (b)  Group One Allocation                $266,846,166.39      $2,120,348,052.94        $0.00

     (c)  Group Two Allocation                 $43,402,211.28        $344,872,086.59        $0.00

     (d)  Series 1997-1 Allocations            $13,421,726.82        $106,648,458.62        $0.00

     (e)  Class A Allocations                  $12,746,669.56        $101,284,482.89        $0.00

          Class B Allocations                     $675,057.26          $5,363,975.73        $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 1997-1                $0.00            $0.00         0.00            $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments
     ----------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                        Total Payments
                                   Amount Paid       Deficit Amount     Through This
                                  This Due Period    This Due Period     Due Period
<S>                                     <C>              <C>               <C>
     Series 1997-1                      $0.00            $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")
     --------------------------------------------------------------------
<TABLE>
<CAPTION>
                                           Deposits Into the
                                             SIFAs This
                                              Due Period       SIFA Balance
     <S>                                   <C>                      <C>
     Series 1997-1                         $3,650,204.80            $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                            $87,822,805.20               $0.00

 (b) Group Two                            $14,284,274.70               $0.00

 (c) Series 1997-1                         $4,417,278.00               $0.00

 (d) Class A                               $4,195,107.21               $0.00

     Class B                                 $222,170.79               $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                                            $26,160,509.44

 (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
     -------------------

     End of Due Period Master Trust Receivables Outstanding $24,108,720,721.41
<TABLE>
<CAPTION>
                                Delinquent Amount               Percentage of Ending
     Payment Status             Ending Balance                  Receivables Outstanding
     <S>                           <C>                                 <C>
     30-59 days                      $637,811,902.88                   2.65%

     60-179 days                   $1,137,628,872.80                   4.72%
</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 September 15, 1998:


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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                                $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                                  $101,284,482.89

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                            $12,746,669.56

 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                                          $3,462,255.63
</TABLE>

<PAGE>   6

<TABLE>
<S>                                                                                    <C>
 9.  The aggregate amount of Class B Principal Collections processed during
     the related Due Period is equal to                                                    $5,363,975.73

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                               $675,057.26

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                                            $187,949.17

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

         IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of September, 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: September 15, 1998   Due Period Ending: August 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      29 days at 6.040630000%   $4.866063056    $4.866063056    $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
 <S>                                                    <C>
 (a) Aggregate Investor Interest                        $18,117,139,009.32
     Seller Interest                                     $5,596,919,006.55

     Total Master Trust                                 $23,714,058,015.87


 (b) Group One Investor Interest                        $15,567,139,009.32

 (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

 (a) Allocation of Collections between Investor and Seller
 <S>                                    <C>               <C>                  <C>
     Aggregate Investor Allocation.     $310,248,377.67   $2,465,220,139.53    $0.00

     Seller:                             $86,844,131.84     $690,059,701.17    $0.00

 (b) Group One Allocation               $266,846,166.39   $2,120,348,052.94    $0.00

 (c) Group Two Allocation                $43,402,211.28     $344,872,086.59    $0.00

 (d) Series 1997-2 Allocations            $8,934,581.46      $70,993,796.41    $0.00

 (e) Class A Allocations                  $8,497,779.70      $67,522,988.59    $0.00

     Class B Allocations                    $436,801.76       $3,470,807.82    $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                         $2,958,055.32            $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                            $87,822,805.20            $0.00

 (b) Group Two                            $14,284,274.70            $0.00

 (c) Series 1997-2                         $2,940,495.71            $0.00

 (d) Class A                               $2,796,738.14            $0.00

     Class B                                 $143,757.57            $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                                            $26,160,509.44

 (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
     -------------------
     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                                   Delinquent Amount         Percentage of Ending
     Payment Status                Ending Balance            Receivables Outstanding
     <S>                           <C>                              <C>
     30-59 days                        $637,811,902.88              2.65%

     60-179 days                     $1,137,628,872.80              4.72%
</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 September 15, 1998:


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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                                $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                                   $67,522,988.59

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                             $8,497,779.70

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

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

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

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

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

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

 8.  The sum of all amounts payable to the Class A Certificateholders
     on the current Distribution Date is equal to                                          $2,830,000.00
</TABLE>

<PAGE>   6

<TABLE>
<S>                                                                                        <C>
 9.  The aggregate amount of Class B Principal Collections processed during
     the related Due Period is equal to                                                    $3,470,807.82

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                               $436,801.76

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

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

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

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

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

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

13.  The sum of all amounts payable to the Class B Certificateholders
     on the current Distribution Date is equal to                                            $128,055.32

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

         IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of September, 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: September 15, 1998   Due Period Ending: August 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      29 days at 5.770630000%  $4.648563056    $4.648563056  $0.000000000

         Class B      29 days at 5.950630000%  $4.793563056    $4.793563056  $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
 <S>                                                    <C>
 (a) Aggregate Investor Interest                        $18,117,139,009.32
     Seller Interest                                     $5,596,919,006.55

     Total Master Trust                                 $23,714,058,015.87


 (b) Group One Investor Interest                        $15,567,139,009.32

 (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 Collections between Investor and Seller
     -----------------------------------------------------
<TABLE>
<CAPTION>
                                         Finance Charge        Principal          Yield
                                          Collections         Collections       Collections

 (a) Allocation of Collections between Investor and Seller
 <S>                                     <C>               <C>                    <C>
     Aggregate Investor Allocation.      $310,248,377.67   $2,465,220,139.53      $0.00

     Seller:                              $86,844,131.84     $690,059,701.17      $0.00

 (b) Group One Allocation                $266,846,166.39   $2,120,348,052.94      $0.00

 (c) Group Two Allocation                 $43,402,211.28     $344,872,086.59      $0.00

 (d) Series 1997-3 Allocations            $11,634,810.54      $92,449,699.33      $0.00

 (e) Class A Allocations                  $11,039,171.77      $87,716,779.57      $0.00

     Class B Allocations                     $595,638.77       $4,732,919.76      $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                         $3,185,558.58            $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                            $87,822,805.20            $0.00

 (b) Group Two                            $14,284,274.70            $0.00

 (c) Series 1997-3                         $3,829,178.86            $0.00

 (d) Class A                               $3,633,145.81            $0.00

     Class B                                 $196,033.05            $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                                            $26,160,509.44

 (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
     -------------------
     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                                       Delinquent Amount     Percentage of Ending
     Payment Status                    Ending Balance        Receivables Outstanding
     <S>                               <C>                          <C>
     30-59 days                          $637,811,902.88            2.65%

     60-179 days                       $1,137,628,872.80            4.72%
</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 September 15, 1998:


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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                                $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                                   $87,716,779.57

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                            $11,039,171.77

 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                                          $3,021,565.99
</TABLE>

<PAGE>   6

<TABLE>
<S>                                                                                       <C>
 9.  The aggregate amount of Class B Principal Collections processed during
     the related Due Period is equal to                                                    $4,732,919.76

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                               $595,638.77

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                                            $163,992.59

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

         IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of September, 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: September 15, 1998   Due Period Ending: August 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      29 days at 5.710630000%    $4.600229722    $4.600229722   $0.000000000

         Class B      29 days at 5.890630000%    $4.745229722    $4.745229722   $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
 <S>                                                    <C>
 (a) Aggregate Investor Interest                        $18,117,139,009.32
     Seller Interest                                     $5,596,919,006.55

     Total Master Trust                                 $23,714,058,015.87


 (b) Group One Investor Interest                        $15,567,139,009.32

 (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

 (a) Allocation of Collections between Investor and Seller

 <S>                                     <C>                <C>                    <C>
     Aggregate Investor Allocation.      $310,248,377.67    $2,465,220,139.53      $0.00

     Seller:                              $86,844,131.84      $690,059,701.17      $0.00

 (b) Group One Allocation                $266,846,166.39    $2,120,348,052.94      $0.00

 (c) Group Two Allocation                 $43,402,211.28      $344,872,086.59      $0.00

 (d) Series 1997-4 Allocations            $13,421,726.82      $106,648,458.62      $0.00

 (e) Class A Allocations                  $12,746,669.56      $101,284,482.89      $0.00

     Class B Allocations                     $675,057.26        $5,363,975.73      $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 1997-4           $0.00         $0.00         0.00         $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments
     ----------------------------------------------------------------
<TABLE>
<CAPTION>
                                                               Total Payments
                              Amount Paid     Deficit Amount    Through This
                             This Due Period  This Due Period    Due Period
     <S>                           <C>             <C>               <C>
     Series 1997-4                 $0.00           $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")
     --------------------------------------------------------------------
<TABLE>
<CAPTION>
                                          Deposits Into the
                                              SIFAs This
                                              Due Period       SIFA Balance
     <S>                                   <C>                      <C>
     Series 1997-4                         $3,637,485.49            $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                            $87,822,805.20            $0.00

 (b) Group Two                            $14,284,274.70            $0.00

 (c) Series 1997-4                         $4,417,278.00            $0.00

 (d) Class A                               $4,195,107.21            $0.00

     Class B                                 $222,170.79            $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                                            $26,160,509.44

 (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
     -------------------
     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                                   Delinquent Amount    Percentage of Ending
     Payment Status                Ending Balance       Receivables Outstanding
     <S>                           <C>                        <C>
     30-59 days                      $637,811,902.88          2.65%

     60-179 days                   $1,137,628,872.80          4.72%
</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 September 15, 1998:


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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                                $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                                  $101,284,482.89

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                            $12,746,669.56

 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                                          $3,450,172.29
</TABLE>

<PAGE>   6

<TABLE>
<S>                                                                                       <C>
 9.  The aggregate amount of Class B Principal Collections processed during
     the related Due Period is equal to                                                    $5,363,975.73

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                               $675,057.26

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                                            $187,313.20

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

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



                           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: September 15, 1998   Due Period Ending: August 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      29 days at 5.730630000%    $4.616340833    $4.616340833   $0.000000000

         Class B      29 days at 5.910630000%    $4.761340833    $4.761340833   $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
 <S>                                                    <C>
 (a) Aggregate Investor Interest                        $18,117,139,009.32
     Seller Interest                                     $5,596,919,006.55

     Total Master Trust                                 $23,714,058,015.87


 (b) Group One Investor Interest                        $15,567,139,009.32

 (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

 (a) Allocation of Collections between Investor and Seller

 <S>                                     <C>                 <C>                    <C>
     Aggregate Investor Allocation.      $310,248,377.67     $2,465,220,139.53      $0.00

     Seller:                              $86,844,131.84       $690,059,701.17      $0.00

 (b) Group One Allocation                $266,846,166.39     $2,120,348,052.94      $0.00

 (c) Group Two Allocation                 $43,402,211.28       $344,872,086.59      $0.00

 (d) Series 1998-1 Allocations             $6,274,061.65        $49,853,421.48      $0.00

 (e) Class A Allocations                   $5,956,387.64        $47,329,197.61      $0.00

     Class B Allocations                     $317,674.01         $2,524,223.87      $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                         $1,703,432.71            $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                            $87,822,805.20            $0.00

 (b) Group Two                            $14,284,274.70            $0.00

 (c) Series 1998-1                         $2,064,881.43            $0.00

 (d) Class A                               $1,960,330.47            $0.00

     Class B                                 $104,550.96            $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                                            $26,160,509.44

 (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
     -------------------
     End of Due Period Master Trust Receivables Outstanding   $24,108,720,721.41

<TABLE>
<CAPTION>
                              Delinquent Amount    Percentage of Ending
     Payment Status           Ending Balance       Receivables Outstanding
     <S>                      <C>                        <C>
     30-59 days                 $637,811,902.88          2.65%

     60-179 days              $1,137,628,872.80          4.72%
</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 September 15, 1998:


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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                                $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                                   $47,329,197.61

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                             $5,956,387.64

 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                                          $1,615,719.29
</TABLE>

<PAGE>   6

<TABLE>
<S>                                                                                        <C>
 9.  The aggregate amount of Class B Principal Collections processed during
     the related Due Period is equal to                                                    $2,524,223.87

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                               $317,674.01

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                                             $87,713.42

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

         IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of September, 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: September 15, 1998   Due Period Ending: August 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>
         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                        $18,117,139,009.32
     Seller Interest                                     $5,596,919,006.55

     Total Master Trust                                 $23,714,058,015.87


 (b) Group One Investor Interest                        $15,567,139,009.32

 (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.      $310,248,377.67    $2,465,220,139.53      $0.00

     Seller:                              $86,844,131.84      $690,059,701.17      $0.00

 (b) Group One Allocation                $266,846,166.39    $2,120,348,052.94      $0.00

 (c) Group Two Allocation                 $43,402,211.28      $344,872,086.59      $0.00

 (d) Series 1998-2 Allocations             $8,934,581.46       $70,993,796.41      $0.00

 (e) Class A Allocations                   $8,497,779.70       $67,522,988.59      $0.00

     Class B Allocations                     $436,801.76        $3,470,807.82      $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            $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                            $87,822,805.20            $0.00

 (b) Group Two                            $14,284,274.70            $0.00

 (c) Series 1998-2                         $2,940,495.71            $0.00

 (d) Class A                               $2,796,738.14            $0.00

     Class B                                 $143,757.57            $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                                            $26,160,509.44
 (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   $24,108,720,721.41

<TABLE>
<CAPTION>
                                Delinquent Amount     Percentage of Ending
     Payment Status             Ending Balance        Receivables Outstanding
     <S>                          <C>                        <C>
     30-59 days                   $637,811,902.88            2.65%

     60-179 days                $1,137,628,872.80            4.72%
</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 September 15, 1998:


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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                                $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                                   $67,522,988.59

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                             $8,497,779.70

 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                                         $15,386,111.13
</TABLE>

<PAGE>   6

<TABLE>
<S>                                                                                        <C>
 9.  The aggregate amount of Class B Principal Collections processed during
     the related Due Period is equal to                                                    $3,470,807.82

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                               $436,801.76

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

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

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

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

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

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

13.  The sum of all amounts payable to the Class B Certificateholders
     on the current Distribution Date is equal to                                            $830,744.95

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

         IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of September, 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: September 15, 1998   Due Period Ending: August 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      29 days at 5.765630000%   $4.644535278   $4.644535278   $0.000000000

         Class B      29 days at 5.930630000%   $4.777451944   $4.777451944   $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
 <S>                                                    <C>
 (a) Aggregate Investor Interest                        $18,117,139,009.32
     Seller Interest                                     $5,596,919,006.55

     Total Master Trust                                 $23,714,058,015.87


 (b) Group One Investor Interest                        $15,567,139,009.32

 (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

 (a) Allocation of Collections between Investor and Seller

 <S>                                     <C>              <C>                    <C>
     Aggregate Investor Allocation.      $310,248,377.67  $2,465,220,139.53      $0.00

     Seller:                              $86,844,131.84    $690,059,701.17      $0.00

 (b) Group One Allocation                $266,846,166.39  $2,120,348,052.94      $0.00

 (c) Group Two Allocation                 $43,402,211.28    $344,872,086.59      $0.00

 (d) Series 1998-3 Allocations            $13,421,726.82    $106,648,458.62      $0.00

 (e) Class A Allocations                  $12,746,669.56    $101,284,482.89      $0.00

     Class B Allocations                     $675,057.26      $5,363,975.73      $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 1998-3           $0.00         $0.00         0.00         $0.00
</TABLE>

5.   Information Concerning Amount of Controlled Liquidation Payments
     ----------------------------------------------------------------
<TABLE>
<CAPTION>
                                                              Total Payments
                              Amount Paid    Deficit Amount   Through This
                             This Due Period This Due Period   Due Period
     <S>                           <C>              <C>               <C>
     Series 1998-3                 $0.00            $0.00             $0.00
</TABLE>

6.   Information Concerning the Series Interest Funding Accounts ("SIFA")
     --------------------------------------------------------------------
<TABLE>
<CAPTION>
                                          Deposits Into the
                                              SIFAs This
                                              Due Period      SIFA Balance
     <S>                                   <C>                      <C>
     Series 1998-3                         $3,671,986.60            $0.00
</TABLE>

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

     Class B                                                 1.00000000
</TABLE>

8.   Investor Charged-Off Amount
     ---------------------------
<TABLE>
<CAPTION>
                                                                  Cumulative
                                                                   Investor
                                                                  Charged-Off
                                          This Due Period           Amount
 <S>                                      <C>                       <C>
 (a) Group One                            $87,822,805.20            $0.00

 (b) Group Two                            $14,284,274.70            $0.00

 (c) Series 1998-3                         $4,417,278.00            $0.00

 (d) Class A                               $4,195,107.21            $0.00

     Class B                                 $222,170.79            $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                                            $26,160,509.44

 (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   $24,108,720,721.41

<TABLE>
<CAPTION>
                            Delinquent Amount      Percentage of Ending
     Payment Status         Ending Balance         Receivables Outstanding
     <S>                    <C>                          <C>
     30-59 days               $637,811,902.88            2.65%

     60-179 days            $1,137,628,872.80            4.72%
</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 September 15, 1998:


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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                                $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                                  $101,284,482.89

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                            $12,746,669.56

 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                                          $3,483,401.46
</TABLE>

<PAGE>   6

<TABLE>
<S>                                                                                        <C>
 9.  The aggregate amount of Class B Principal Collections processed during
     the related Due Period is equal to                                                    $5,363,975.73

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                               $675,057.26

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                                            $188,585.14

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

         IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of September, 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: September 15, 1998   Due Period Ending: August 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                        $18,117,139,009.32
     Seller Interest                                     $5,596,919,006.55

     Total Master Trust                                 $23,714,058,015.87


 (b) Group One Investor Interest                        $15,567,139,009.32

 (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

 (a) Allocation of Collections between Investor and Seller

 <S>                                     <C>                <C>                    <C>
     Aggregate Investor Allocation.      $310,248,377.67    $2,465,220,139.53      $0.00

     Seller:                              $86,844,131.84      $690,059,701.17      $0.00

 (b) Group One Allocation                $266,846,166.39    $2,120,348,052.94      $0.00

 (c) Group Two Allocation                 $43,402,211.28      $344,872,086.59      $0.00

 (d) Series 1998-4 Allocations             $8,934,581.46       $70,993,796.41      $0.00

 (e) Class A Allocations                   $8,497,779.70       $67,522,988.59      $0.00

     Class B Allocations                     $436,801.76        $3,470,807.82      $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   $13,131,145.72
</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                            $87,822,805.20            $0.00

 (b) Group Two                            $14,284,274.70            $0.00

 (c) Series 1998-4                         $2,940,495.71            $0.00

 (d) Class A                               $2,796,738.14            $0.00

     Class B                                 $143,757.57            $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                                            $26,160,509.44

 (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   $24,108,720,721.41

<TABLE>
<CAPTION>
                               Delinquent Amount      Percentage of Ending
     Payment Status            Ending Balance         Receivables Outstanding
     <S>                       <C>                          <C>
     30-59 days                  $637,811,902.88            2.65%

     60-179 days               $1,137,628,872.80            4.72%
</TABLE>


                                 U.S. BANK NATIONAL ASSOCIATION
                                 as Trustee


                              BY:
                                 -----------------------------

                                        Vice President



<PAGE>   5

                     MASTER SERVICER'S CERTIFICATE STATEMENT

                          Discover Card Master Trust I

                         Series 1998-4 Monthly Statement

                                   CREDIT CARD
                            PASS-THROUGH CERTIFICATES

         The undersigned, a duly authorized representative of Greenwood Trust
Company ("Greenwood"), as Master Servicer pursuant to the Pooling & Servicing
Agreement dated as of October 1, 1993 (the"Pooling & Servicing Agreement") and
the Series Supplement, dated as of April 9, 1998 (the "Series Supplement") by
and between Greenwood and U.S. Bank National Association, as Trustee, does
hereby certify as follows with respect to the Supplement Discover Card Master
Trust I, Series 1998-4 Master Trust Certificates for the Distribution Date
occurring on September 15, 1998:


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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                                $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                                   $67,522,988.59

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                             $8,497,779.70

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

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

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

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

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

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

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

<PAGE>   6

<TABLE>
<S>                                                                                        <C>
 9.  The aggregate amount of Class B Principal Collections processed during
     the related Due Period is equal to                                                    $3,470,807.82

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                               $436,801.76

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

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

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

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

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

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

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

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

         IN WITNESS WHEREOF, the undersigned has duly executed and delivered
certificate this 15th day of September, 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: September 15, 1998   Due Period Ending: August 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>
<CAPTION>
     Series  1998-6                                Total          Interest     Principal
         <S>          <C>                      <C>             <C>           <C>
         Class A      30 days at 5.850000000%  $4.875000000    $4.875000000  $0.000000000

         Class B      30 days at 6.050000000%  $5.041666667    $5.041666667  $0.000000000
</TABLE>

2.   Principal Receivables at the end of the Due Period
     --------------------------------------------------
<TABLE>
  <S>                                                   <C>
  (a)  Aggregate Investor Interest                      $18,117,139,009.32
       Seller Interest                                   $5,596,919,006.55

       Total Master Trust                               $23,714,058,015.87


  (b)  Group One Investor Interest                      $15,567,139,009.32

  (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.                            $310,248,377.67      $2,465,220,139.53            $0.00

       Seller:                                                    $86,844,131.84        $690,059,701.17            $0.00

  (b)  Group One Allocation                                      $266,846,166.39      $2,120,348,052.94            $0.00

  (c)  Group Two Allocation                                       $43,402,211.28        $344,872,086.59            $0.00

  (d)  Series 1998-6 Allocations                                   $8,934,581.46         $70,993,796.41            $0.00

  (e)  Class A Allocations                                         $8,497,779.70         $67,522,988.59            $0.00

       Class B Allocations                                           $436,801.76          $3,470,807.82            $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                         $2,570,176.50    $3,855,264.75
</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                          $87,822,805.20                $0.00
                      
  (b)  Group Two                          $14,284,274.70                $0.00
                      
  (c)  Series 1998-6                       $2,940,495.71                $0.00
                      
  (d)  Class A                             $2,796,738.14                $0.00
                      
       Class B                               $143,757.57                $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                                          $26,160,509.44
                        
  (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>
     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   $24,108,720,721.41

<TABLE>
<CAPTION>
                         Delinquent Amount  Percentage of Ending
     Payment Status      Ending Balance     Receivables Outstanding
     <S>              <C>                        <C>
     30-59 days         $637,811,902.88          2.65%

     60-179 days      $1,137,628,872.80          4.72%
</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 September 15, 1998:


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

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

 3.  The aggregate amount of Collections processed during the related Due
     Period is equal to                                                                $3,552,372,350.30

 4.  The aggregate amount of Class A Principal Collections processed during
     the related Due Period is equal to                                                   $67,522,988.59

 5.  The aggregate amount of Class A Finance Charge Collections processed
     during the related Due Period is equal to                                             $8,497,779.70

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

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

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

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

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

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

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

<PAGE>   6

<TABLE>
<S>                                                                                        <C>
 9.  The aggregate amount of Class B Principal Collections processed during
     the related Due Period is equal to                                                    $3,470,807.82

10.  The aggregate amount of Class B Finance Charge Collections processed
     during the related Due Period is equal to                                               $436,801.76

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

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

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

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

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

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

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

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

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



                           GREENWOOD TRUST COMPANY
                             as Master Servicer

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



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