MFS SERIES TRUST X
NSAR-B, 1998-09-29
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<PAGE>      PAGE  1
000 B000000 07/31/98
000 C000000 0000783740
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 MFS SERIES TRUST X
001 B000000 811-4492
001 C000000 6179545000
002 A000000 500 BOYLSTON STREET
002 B000000 BOSTON
002 C000000 MA
002 D010000 02116
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  4
007 C010100  1
007 C020100 MFS GOVERNMENT MORTGAGE FUND
007 C030100 N
007 C010200  2
007 C020200 MFS EMERGING MARKETS DEBT FUND
007 C030200 N
007 C010300  3
007 C020300 MFS SMALL CAP VALUE FUND
007 C030300 N
007 C010400  4
007 C020400 MFS STRATEGIC VALUE FUND
007 C030400 N
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
008 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
008 B00AA01 A
008 C00AA01 801-17352
008 D01AA01 BOSTON
008 D02AA01 MA
008 D03AA01 02116
010 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
010 B00AA01 701-17352
010 C01AA01 BOSTON
010 C02AA01 MA
010 C03AA01 02116
<PAGE>      PAGE  2
011 A00AA01 MFS FUND DISTRIBUTORS, INC.
011 B00AA01 8-27864
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02116
012 A00AA01 MFS SERVICE CENTER, INC.
012 B00AA01 84-1316
012 C01AA01 BOSTON
012 C02AA01 MA
012 C03AA01 02116
015 A00AA01 STATE STREET BANK AND TRUST COMPANY
015 B00AA01 C
015 C01AA01 BOSTON
015 C02AA01 MA
015 C03AA01 02110
015 E01AA01 X
015 A00AA02 STATE STREET BANK AND TRUST COMPANY
015 B00AA02 S
015 C01AA02 BOSTON
015 C02AA02 MA
015 C03AA02 02110
015 E04AA02 X
015 A00AA03 THE BANK OF NEW YORK
015 B00AA03 S
015 C01AA03 NEW YORK
015 C02AA03 NY
015 C03AA03 10286
015 E01AA03 X
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   52
019 C00AA00 MASSFINSER
020 A000001 INSTINET
020 C000001      0
020 A000002 NATIONAL FINANCIAL SERVIC
020 C000002      0
020 A000003 DUNLEVY + CO, INC.
020 C000003      0
020 A000004 BANQUES S.G. WARBURG
020 C000004      0
020 A000005 GOLDMAN SACHS + CO
020 C000005      0
020 A000006 SMITH BARNEY INC.
020 C000006      0
020 A000007 CS FIRST BOSTON CORP.
020 C000007      0
020 A000008 WEEDEN + CO.
020 C000008      0
020 A000009 ALEX,BROWN + SONS, INC.
020 C000009      0
020 A000010 MERRILL LYNCH PIERCE FENNER
<PAGE>      PAGE  3
020 C000010      0
021  000000        2
022 A000001 GOLDMAN SACHS & CO.
022 B000001 13-5108880
022 C000001   7902874
022 D000001     33662
022 A000002 SALOMON BROTHERS
022 B000002 13-3082694
022 C000002    126325
022 D000002    150641
022 A000003 MERRILL LYNCH
022 B000003 13-5674085
022 C000003    118122
022 D000003     70239
022 A000004 MORGAN STANLEY
022 B000004 13-2655998
022 C000004     95059
022 D000004     48408
022 A000005 PAINE WEBBER
022 B000005 13-2638166
022 C000005     50815
022 D000005     62762
022 A000006 LEHMAN BROS.
022 B000006 13-2518466
022 C000006     54898
022 D000006     48869
022 A000007 CJ LAWRENCE
022 B000007 00-0000000
022 C000007     25534
022 D000007     34035
022 A000008 CS FIRST BOSTON CORP.
022 B000008 13-5659485
022 C000008     38880
022 D000008     17410
022 A000009 BEAR STEARNS
022 B000009 13-3299429
022 C000009      9441
022 D000009     46806
022 A000010 FIRST ALBANY CORP.
022 B000010 00-0000000
022 C000010         0
022 D000010     38270
023 C000000    8477682
023 D000000     615153
026 A000000 Y
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
<PAGE>      PAGE  4
026 G020000 N
026 H000000 N
027  000000 Y
037  00AA00 N
038  00AA00      0
039  00AA00 N
040  00AA00 Y
041  00AA00 Y
054 A00AA00 Y
054 B00AA00 Y
054 C00AA00 N
054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
054 G00AA00 N
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 N
054 L00AA00 N
054 M00AA00 Y
054 N00AA00 N
054 O00AA00 N
077 A000000 Y
077 B000000 Y
077 H000000 Y
077 Q010000 Y
078  000000 N
080 A00AA00 NATIONAL UNION INSURANCE
080 B00AA00 FEDERAL INSURANCE
080 C00AA00    80000
081 A00AA00 Y
081 B00AA00 120
082 B00AA00      100
083 A00AA00 N
083 B00AA00        0
084 A00AA00 N
084 B00AA00        0
085 A00AA00 Y
085 B00AA00 N
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086 A020000      0
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<PAGE>      PAGE  5
086 F020000      0
013 A000101 DELOITTE & TOUCHE LLP
013 B010101 BOSTON
013 B020101 MA
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024  000100 Y
025 A000101 GOLDMAN SACHS
025 B000101 13-5108880
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<PAGE>      PAGE  6
031 B000100      0
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050  000100 N
051  000100 N
052  000100 N
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053 B000100 N
053 C000100 Y
055 A000100 Y
<PAGE>      PAGE  7
055 B000100 N
056  000100 Y
057  000100 N
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059  000100 Y
060 A000100 Y
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062 H000100   0.0
062 I000100   0.0
062 J000100   0.0
062 K000100   0.0
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062 M000100   6.3
062 N000100  92.7
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063 B000100  8.2
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066 A000100 N
067  000100 N
068 A000100 N
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070 D010100 N
070 D020100 N
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070 E020100 Y
070 F010100 N
070 F020100 N
070 G010100 Y
070 G020100 N
070 H010100 N
070 H020100 N
<PAGE>      PAGE  8
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 N
070 K010100 Y
070 K020100 N
070 L010100 N
070 L020100 N
070 M010100 N
070 M020100 N
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070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 Y
070 P020100 N
070 Q010100 N
070 Q020100 N
070 R010100 Y
070 R020100 N
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072 T000100     3796
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072AA000100     9772
<PAGE>      PAGE  9
072BB000100        0
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072CC020100    12706
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072DD020100    11610
072EE000100     2460
073 A010100   0.4100
073 A020100   0.3500
073 B000100   0.0200
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074 A000100       37
074 B000100        0
074 C000100     1814
074 D000100   804153
074 E000100        0
074 F000100        0
074 G000100        0
074 H000100        0
074 I000100        0
074 J000100        0
074 K000100        0
074 L000100     7710
074 M000100        7
074 N000100   813721
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074 P000100      206
074 Q000100        0
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074 R030100        0
074 R040100     1406
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074 T000100   812109
074 U010100    98098
074 U020100    23191
074 V010100     6.69
074 V020100     6.70
074 W000100   0.0000
074 X000100    53835
074 Y000100      809
075 A000100        0
075 B000100   873284
076  000100     0.00
013 A000201 ERNST & YOUNG
013 B010201 BOSTON
013 B020201 MA
013 B030201 02116
024  000200 N
028 A010200         0
028 A020200         0
028 A030200         0
<PAGE>      PAGE  10
028 A040200         0
028 B010200      1000
028 B020200         0
028 B030200         0
028 B040200         0
028 C010200         0
028 C020200         0
028 C030200         0
028 C040200         0
028 D010200         1
028 D020200         0
028 D030200         0
028 D040200         0
028 E010200         0
028 E020200         0
028 E030200         0
028 E040200         0
028 F010200         1
028 F020200         0
028 F030200         0
028 F040200         1
028 G010200      1002
028 G020200         0
028 G030200         0
028 G040200         1
028 H000200      1002
029  000200 N
030 A000200      0
030 B000200  0.00
030 C000200  0.00
031 A000200      0
031 B000200      0
032  000200      0
033  000200      0
034  000200 N
035  000200      0
036 B000200      0
042 A000200   0
042 B000200   0
042 C000200   0
042 D000200   0
042 E000200   0
042 F000200   0
042 G000200   0
042 H000200   0
043  000200      0
044  000200      0
045  000200 Y
046  000200 N
047  000200 Y
048  000200  0.850
<PAGE>      PAGE  11
048 A010200        0
048 A020200 0.000
048 B010200        0
048 B020200 0.000
048 C010200        0
048 C020200 0.000
048 D010200        0
048 D020200 0.000
048 E010200        0
048 E020200 0.000
048 F010200        0
048 F020200 0.000
048 G010200        0
048 G020200 0.000
048 H010200        0
048 H020200 0.000
048 I010200        0
048 I020200 0.000
048 J010200        0
048 J020200 0.000
048 K010200        0
048 K020200 0.000
049  000200 N
050  000200 N
051  000200 N
052  000200 N
053 A000200 Y
053 B000200 Y
053 C000200 Y
055 A000200 Y
055 B000200 N
056  000200 Y
057  000200 N
058 A000200 N
059  000200 Y
060 A000200 N
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062 A000200 Y
062 B000200   0.0
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062 M000200   0.0
<PAGE>      PAGE  12
062 N000200  12.0
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062 Q000200  84.4
062 R000200   3.6
063 A000200   0
063 B000200 17.4
064 A000200 N
064 B000200 N
066 A000200 N
067  000200 N
068 A000200 N
068 B000200 Y
069  000200 N
070 A010200 Y
070 A020200 N
070 B010200 N
070 B020200 N
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070 C020200 N
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070 D020200 N
070 E010200 Y
070 E020200 N
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070 H010200 Y
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 N
070 K010200 Y
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070 L010200 Y
070 L020200 Y
070 M010200 Y
070 M020200 Y
070 N010200 Y
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<PAGE>      PAGE  13
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<PAGE>      PAGE  14
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<PAGE>      PAGE  15
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<PAGE>      PAGE  16
048 K020300 0.000
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050  000300 N
051  000300 N
052  000300 N
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055 B000300 N
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<PAGE>      PAGE  17
070 B020300 N
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070 J020300 N
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<PAGE>      PAGE  18
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<PAGE>      PAGE  19
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028 C020400         0
028 C030400         0
028 C040400         2
028 D010400       106
028 D020400         0
028 D030400         0
028 D040400         0
028 E010400        12
028 E020400         0
028 E030400         0
028 E040400         1
028 F010400         5
028 F020400         0
028 F030400         0
028 F040400         1
028 G010400       718
028 G020400         0
028 G030400         0
028 G040400         5
028 H000400       558
029  000400 N
030 A000400      0
030 B000400  0.00
030 C000400  0.00
031 A000400      0
031 B000400      0
032  000400      0
033  000400      0
034  000400 N
035  000400      0
036 B000400      0
042 A000400   0
<PAGE>      PAGE  20
042 B000400   0
042 C000400   0
042 D000400   0
042 E000400   0
042 F000400   0
042 G000400   0
042 H000400   0
043  000400      0
044  000400      0
045  000400 Y
046  000400 N
047  000400 Y
048  000400  0.750
048 A010400        0
048 A020400 0.000
048 B010400        0
048 B020400 0.000
048 C010400        0
048 C020400 0.000
048 D010400        0
048 D020400 0.000
048 E010400        0
048 E020400 0.000
048 F010400        0
048 F020400 0.000
048 G010400        0
048 G020400 0.000
048 H010400        0
048 H020400 0.000
048 I010400        0
048 I020400 0.000
048 J010400        0
048 J020400 0.000
048 K010400        0
048 K020400 0.000
049  000400 N
050  000400 N
051  000400 N
052  000400 N
053 A000400 Y
053 B000400 Y
053 C000400 Y
055 A000400 N
055 B000400 N
056  000400 Y
057  000400 N
058 A000400 N
059  000400 Y
060 A000400 Y
060 B000400 Y
061  000400     1000
<PAGE>      PAGE  21
062 A000400 N
062 B000400   0.0
062 C000400   0.0
062 D000400   0.0
062 E000400   0.0
062 F000400   0.0
062 G000400   0.0
062 H000400   0.0
062 I000400   0.0
062 J000400   0.0
062 K000400   0.0
062 L000400   0.0
062 M000400   0.0
062 N000400   0.0
062 O000400   0.0
062 P000400   0.0
062 Q000400   0.0
062 R000400   0.0
063 A000400   0
063 B000400  0.0
066 A000400 Y
066 B000400 N
066 C000400 Y
066 D000400 N
066 E000400 N
066 F000400 N
066 G000400 N
067  000400 N
068 A000400 N
068 B000400 N
069  000400 N
070 A010400 Y
070 A020400 N
070 B010400 N
070 B020400 N
070 C010400 Y
070 C020400 N
070 D010400 N
070 D020400 N
070 E010400 Y
070 E020400 N
070 F010400 Y
070 F020400 N
070 G010400 Y
070 G020400 N
070 H010400 Y
070 H020400 N
070 I010400 N
070 I020400 N
070 J010400 Y
070 J020400 N
<PAGE>      PAGE  22
070 K010400 Y
070 K020400 N
070 L010400 Y
070 L020400 Y
070 M010400 Y
070 M020400 Y
070 N010400 Y
070 N020400 N
070 O010400 Y
070 O020400 N
070 P010400 Y
070 P020400 N
070 Q010400 N
070 Q020400 N
070 R010400 Y
070 R020400 N
071 A000400      1020
071 B000400       306
071 C000400       639
071 D000400   48
072 A000400  5
072 B000400        1
072 C000400        5
072 D000400        0
072 E000400        0
072 F000400        2
072 G000400        0
072 H000400        0
072 I000400        0
072 J000400        0
072 K000400        0
072 L000400        7
072 M000400        0
072 N000400        4
072 O000400        0
072 P000400        0
072 Q000400        0
072 R000400        5
072 S000400        1
072 T000400        1
072 U000400        0
072 V000400        0
072 W000400        1
072 X000400       21
072 Y000400       18
072 Z000400        3
072AA000400       36
072BB000400        0
072CC010400        0
072CC020400        0
072DD010400        0
<PAGE>      PAGE  23
072DD020400        0
072EE000400        0
073 A010400   0.0000
073 A020400   0.0000
073 B000400   0.0000
073 C000400   0.0000
074 A000400        0
074 B000400        0
074 C000400        0
074 D000400        0
074 E000400        6
074 F000400      744
074 G000400        0
074 H000400        0
074 I000400        0
074 J000400        4
074 K000400        0
074 L000400        1
074 M000400        0
074 N000400      755
074 O000400        4
074 P000400        0
074 Q000400        0
074 R010400        0
074 R020400        0
074 R030400        0
074 R040400        0
074 S000400        0
074 T000400      751
074 U010400       55
074 U020400        0
074 V010400    10.66
074 V020400     0.00
074 W000400   0.0000
074 X000400       27
074 Y000400        0
075 A000400        0
075 B000400      679
076  000400     0.00
SIGNATURE   JAMES O. YOST                                
TITLE       ASSISTANT TREASURER 
 


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME>  SERIES TRUST X
<SERIES>
   <NUMBER> 021
   <NAME> EMERGING MARKETS DEBT FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   5-MOS
<FISCAL-YEAR-END>                          JUL-31-1998
<PERIOD-START>                             MAR-17-1998
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<INVESTMENTS-AT-COST>                           990633
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<GROSS-EXPENSE>                                  25477
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<PER-SHARE-NAV-BEGIN>                            10.00
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<AVG-DEBT-PER-SHARE>                              0.00
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME>  SERIES TRUST X
<SERIES>
   <NUMBER> 022
   <NAME> EMERGING MARKETS DEBT FUND CLASS I
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   5-MOS
<FISCAL-YEAR-END>                          JUL-31-1998
<PERIOD-START>                             MAR-17-1998
<PERIOD-END>                               JUL-31-1998
<INVESTMENTS-AT-COST>                           990633
<INVESTMENTS-AT-VALUE>                          925167
<RECEIVABLES>                                    32930
<ASSETS-OTHER>                                       0 
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<TOTAL-ASSETS>                                  959861
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<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       1001461
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<ACCUMULATED-NII-CURRENT>                        26483
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<OVERDISTRIBUTION-GAINS>                        (3546)
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<AVG-DEBT-PER-SHARE>                              0.00
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 011
   <NAME> MFS GOVERNMENT MORTGAGE FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
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<PERIOD-START>                             AUG-01-1997
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<INVESTMENTS-AT-COST>                        804658166
<INVESTMENTS-AT-VALUE>                       805966765
<RECEIVABLES>                                  7710110
<ASSETS-OTHER>                                    7074
<OTHER-ITEMS-ASSETS>                             37198
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<TOTAL-LIABILITIES>                            1611660
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     853171339
<SHARES-COMMON-STOCK>                         98097509
<SHARES-COMMON-PRIOR>                         97254938
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<OVERDISTRIBUTION-GAINS>                    (42192909)
<ACCUM-APPREC-OR-DEPREC>                       1315334
<NET-ASSETS>                                 812109487
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<APPREC-INCREASE-CURRENT>                   (12706230)
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<NUMBER-OF-SHARES-REDEEMED>                 (20335888)
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<NET-CHANGE-IN-ASSETS>                     (127582573)
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<OVERDISTRIB-NII-PRIOR>                       (164064)
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<PER-SHARE-NII>                                   0.43
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 012
   <NAME> MFS GOVERNMENT MORTGAGE FUND CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          JUL-31-1998
<PERIOD-START>                             AUG-01-1997
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<INVESTMENTS-AT-COST>                        804658166
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<RECEIVABLES>                                  7710110
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<EQUALIZATION>                                       0
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<AVERAGE-NET-ASSETS>                         873284304
<PER-SHARE-NAV-BEGIN>                             6.72
<PER-SHARE-NII>                                   0.38
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<EXPENSE-RATIO>                                   1.72
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 013
   <NAME> MFS GOVERNMENT MORTGAGE FUND CLASS I
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          JUL-31-1998
<PERIOD-START>                             AUG-01-1997
<PERIOD-END>                               JUL-31-1998
<INVESTMENTS-AT-COST>                        804658166
<INVESTMENTS-AT-VALUE>                       805966765
<RECEIVABLES>                                  7710110
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<TOTAL-ASSETS>                               813721147
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<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      1611660
<TOTAL-LIABILITIES>                            1611660
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     853171339
<SHARES-COMMON-STOCK>                             7649
<SHARES-COMMON-PRIOR>                            16882
<ACCUMULATED-NII-CURRENT>                            0
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<OVERDISTRIBUTION-GAINS>                    (42192909)
<ACCUM-APPREC-OR-DEPREC>                       1315334
<NET-ASSETS>                                 812109487
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                             64403388
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 9853125
<NET-INVESTMENT-INCOME>                       54550263
<REALIZED-GAINS-CURRENT>                       9772406
<APPREC-INCREASE-CURRENT>                   (12706230)
<NET-CHANGE-FROM-OPS>                         51616439
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (5097)
<DISTRIBUTIONS-OF-GAINS>                         (241)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           1275
<NUMBER-OF-SHARES-REDEEMED>                    (11278)
<SHARES-REINVESTED>                                770
<NET-CHANGE-IN-ASSETS>                     (127582573)
<ACCUMULATED-NII-PRIOR>                              0
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<OVERDISTRIB-NII-PRIOR>                       (164064)
<OVERDIST-NET-GAINS-PRIOR>                 (124937835)
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<GROSS-EXPENSE>                               10092700
<AVERAGE-NET-ASSETS>                         873284304
<PER-SHARE-NAV-BEGIN>                             6.72
<PER-SHARE-NII>                                   0.44
<PER-SHARE-GAIN-APPREC>                         (0.02)
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<EXPENSE-RATIO>                                   0.73
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SMALL CAP VALUE FUND-CLASS A         
<SERIES>
   <NUMBER> 031
   <NAME> MFS SERIES TRUST X
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          JUL-31-1998
<PERIOD-START>                             MAR-17-1998
<PERIOD-END>                               JUL-31-1998
<INVESTMENTS-AT-COST>                           870590
<INVESTMENTS-AT-VALUE>                          813154
<RECEIVABLES>                                   105429
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<OTHER-ITEMS-LIABILITIES>                           30
<TOTAL-LIABILITIES>                              15247
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        906230
<SHARES-COMMON-STOCK>                            41760
<SHARES-COMMON-PRIOR>                                0
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<ACCUM-APPREC-OR-DEPREC>                       (57482)
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<INTEREST-INCOME>                                 1981
<OTHER-INCOME>                                    (56)
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<REALIZED-GAINS-CURRENT>                         54961
<APPREC-INCREASE-CURRENT>                      (57482)
<NET-CHANGE-FROM-OPS>                           (2167)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
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<NUMBER-OF-SHARES-REDEEMED>                    (12642)
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<NET-CHANGE-IN-ASSETS>                          904063
<ACCUMULATED-NII-PRIOR>                              0
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<EXPENSE-RATIO>                                   1.30
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SMALL CAP VALUE FUND-CLASS I         
<SERIES>
   <NUMBER> 032
   <NAME> MFS SERIES TRUST X
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          JUL-31-1998
<PERIOD-START>                             MAR-17-1998
<PERIOD-END>                               JUL-31-1998
<INVESTMENTS-AT-COST>                           870590
<INVESTMENTS-AT-VALUE>                          813154
<RECEIVABLES>                                   105429
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                               727
<TOTAL-ASSETS>                                  919310
<PAYABLE-FOR-SECURITIES>                         15217
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                           30
<TOTAL-LIABILITIES>                              15247
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        906230
<SHARES-COMMON-STOCK>                            48489
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                          277
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          55038
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       (57482)
<NET-ASSETS>                                    904063
<DIVIDEND-INCOME>                                 2324
<INTEREST-INCOME>                                 1981
<OTHER-INCOME>                                    (56)
<EXPENSES-NET>                                  (3895)
<NET-INVESTMENT-INCOME>                            354
<REALIZED-GAINS-CURRENT>                         54961
<APPREC-INCREASE-CURRENT>                      (57482)
<NET-CHANGE-FROM-OPS>                           (2167)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          49168
<NUMBER-OF-SHARES-REDEEMED>                      (679)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                          904063
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
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<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  25612
<AVERAGE-NET-ASSETS>                            809961
<PER-SHARE-NAV-BEGIN>                            10.00
<PER-SHARE-NII>                                   0.01
<PER-SHARE-GAIN-APPREC>                           0.01
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 041
   <NAME> MFS STRATEGIC VALUE FUND A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   5-MOS
<FISCAL-YEAR-END>                          JUL-31-1998
<PERIOD-START>                             MAR-17-1998
<PERIOD-END>                               JUL-31-1998
<INVESTMENTS-AT-COST>                           750052
<INVESTMENTS-AT-VALUE>                          749856
<RECEIVABLES>                                     5349
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                               109
<TOTAL-ASSETS>                                  755314
<PAYABLE-FOR-SECURITIES>                          4400
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                           26
<TOTAL-LIABILITIES>                               4426
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        712446
<SHARES-COMMON-STOCK>                            54888
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                         3050
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          35588
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         (196)
<NET-ASSETS>                                    750888
<DIVIDEND-INCOME>                                 5257
<INTEREST-INCOME>                                 1067
<OTHER-INCOME>                                   (132)
<EXPENSES-NET>                                  (3139)
<NET-INVESTMENT-INCOME>                           3053
<REALIZED-GAINS-CURRENT>                         35585
<APPREC-INCREASE-CURRENT>                        (196)
<NET-CHANGE-FROM-OPS>                            38442
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          55362
<NUMBER-OF-SHARES-REDEEMED>                      (474)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                          750888
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
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<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  21392
<AVERAGE-NET-ASSETS>                            679070
<PER-SHARE-NAV-BEGIN>                            10.00
<PER-SHARE-NII>                                    .05
<PER-SHARE-GAIN-APPREC>                            .61
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.66
<EXPENSE-RATIO>                                   1.25
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 042
   <NAME> MFS STRATEGIC VALUE FUND I
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   5-MOS
<FISCAL-YEAR-END>                          JUL-31-1998
<PERIOD-START>                             MAR-17-1998
<PERIOD-END>                               JUL-31-1998
<INVESTMENTS-AT-COST>                           750052
<INVESTMENTS-AT-VALUE>                          749856
<RECEIVABLES>                                     5349
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                               109
<TOTAL-ASSETS>                                  755314
<PAYABLE-FOR-SECURITIES>                          4400
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                           26
<TOTAL-LIABILITIES>                               4426
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        712446
<SHARES-COMMON-STOCK>                            15547
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                         3050
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          35588
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         (196)
<NET-ASSETS>                                    750888
<DIVIDEND-INCOME>                                 5257
<INTEREST-INCOME>                                 1067
<OTHER-INCOME>                                   (132)
<EXPENSES-NET>                                  (3139)
<NET-INVESTMENT-INCOME>                           3053
<REALIZED-GAINS-CURRENT>                         35585
<APPREC-INCREASE-CURRENT>                        (196)
<NET-CHANGE-FROM-OPS>                            38442
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          15558
<NUMBER-OF-SHARES-REDEEMED>                       (11)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                          750888
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             1885
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  21392
<AVERAGE-NET-ASSETS>                            679070
<PER-SHARE-NAV-BEGIN>                            10.00
<PER-SHARE-NII>                                    .05
<PER-SHARE-GAIN-APPREC>                            .60
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.65
<EXPENSE-RATIO>                                   1.25
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>


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