MFS SERIES TRUST X, 497J, 2000-12-01

MFS SERIES TRUST X
497J, 2000-12-01

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                    MASSACHUSETTS FINANCIAL SERVICES COMPANY
              500 BOYLSTON STREET, BOSTON, MASSACHUSETTS 02116-3741
                                 (617) 954-5000



                                        December 1, 2000



VIA EDGAR

Securities and Exchange Commission
Judiciary Plaza

450 Fifth Street, NW
Washington, DC  20549

         Re:   MFS(R)Series  Trust  X  (the  "Trust")  (File  Nos.  33-1657  and
               811-4492) on Behalf of  MFS(R)Government  Mortgage  Fund ("MGM"),
               MFS(R)Emerging  Markets  Debt Fund  ("EMD")  and  MFS(R)Strategic
               Value Fund ("SVF")

Ladies and Gentlemen:

         Pursuant to Rule 497(j) under the  Securities  Act of 1933, as amended,
please  accept  this  letter on behalf  of the Trust as  certification  that the
Prospectuses  and  Statements  of  Additional  Information  for the Trust do not
differ from those contained in Post-Effective  Amendment No. 32 for MGM, EMD and
SVF (the  "Amendment") to the Trust's  Registration  Statement on Form N-1A. The
Amendment was filed electronically on November 28, 2000 for MGM, EMD and SVF.

         Please  call the  undersigned  or Claudia  Murphy at (617)  954-5406 or
(800) 343-2829 with any questions you may have.

                                        Very truly yours,




                                        MICHAEL H. WHITAKER
                                        Michael H. Whitaker
                                        Counsel

MHW/bjn