MFS SERIES TRUST X, 497J, 2000-10-02

MFS SERIES TRUST X
497J, 2000-10-02

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





                                        October 2, 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
               811-4992) on Behalf of  MFS(R)International  Growth Fund ("FGF"),
               MFS(R)International   Growth  and   Income   Fund   ("FGI")   and
               MFS(R)Emerging Markets Equity Fund ("FEM")

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. 28 for FGF, FGI and
FEM (the  "Amendment") to the Trust's  Registration  Statement on Form N-1A. The
Amendment was filed electronically on September 29, 2000 for FGF, FGI and FEM.

         Please  call the  undersigned  or Martha  Donovan at (617)  954-5842 or
(800) 343-2829 with any questions you may have.

                                        Very truly yours,



                                        MICHAEL H. WHITAKR
                                        Michael H. Whitaker
                                        Counsel

MHW/bjn