[Fiserv Logo]

April 7, 2000

Fiserv, Inc.
255 Fiserv Drive
Brookfield, WI 53045

Subject: REGISTRATION STATEMENT ON FORM S-8

Dear Sirs:

I have acted as counsel for Fiserv, Inc., a Wisconsin corporation ("Fiserv"), in
connection  with its  Registration  Statement  on Form  S-8  (the  "Registration
Statement"), filed under the Securities Act of 1933 (the "Act"), relating to the
proposed  sales of up to 6,000,000  shares of its Common  Stock,  $.01 par value
(the  "Shares"),  and related  Preferred  Stock Purchase  Rights pursuant to the
Fiserv, Inc. Stock Option Plan.

In that connection,  I have examined originals, or copies certified or otherwise
identified to my  satisfaction of such  documents,  corporate  records and other
instruments  as I have deemed  necessary  or  appropriate  for  purposes of this
opinion,  including the Articles of Incorporation,  as amended,  and By-Laws, as
amended, of Fiserv.

Based upon the foregoing, I am of the opinion that:

1.   Fiserv has been duly  organized  and is validly  existing as a  corporation
     under the laws of the State of Wisconsin.

2.   The Shares have been duly  authorized and are validly issued and fully paid
     and  nonassessable,  except  as  provided  in  Section  180.0622(b)  of the
     Wisconsin Business Corporation Law.

3.   The Rights to be issued with the Common  Stock when issued  pursuant to the
     terms of the Fiserv Rights Agreement will be validly issued.

I hereby  consent to the use of this  opinion as an exhibit to the  Registration
Statement  and to the reference to me under "Legal  Matters" in the  Information
Statement  comprising  a part  of the  Registration  Statement.  By  giving  the
foregoing  consent,  I do not admit that I come  within the  category of persons
whose consent is required under Section 7 of the Act.

Very truly yours,

/S/ CHARLES W. SPRAGUE

Charles W. Sprague

Executive Vice President, General Counsel,
Chief Administrative Officer and Secretary