<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000892538
<NAME> SUNAMERICA SERIES TRUST
<SERIES>
<NUMBER> 011
<NAME> SUNAMERICA SERIES TRUST MFS TOTAL RETURN PORTFOLIO
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JAN-31-2001
<PERIOD-START> FEB-01-2000
<PERIOD-END> JUL-31-2000
<INVESTMENTS-AT-COST> 224,517,316
<INVESTMENTS-AT-VALUE> 230,869,610
<RECEIVABLES> 5,123,467
<ASSETS-OTHER> 2,816
<OTHER-ITEMS-ASSETS> 95,265
<TOTAL-ASSETS> 236,091,158
<PAYABLE-FOR-SECURITIES> 2,664,445
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 271,147
<TOTAL-LIABILITIES> 2,935,592
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 215,058,065
<SHARES-COMMON-STOCK> 15,588,632
<SHARES-COMMON-PRIOR> 15,047,296
<ACCUMULATED-NII-CURRENT> 9,754,438
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,992,392
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 6,350,671
<NET-ASSETS> 233,155,566
<DIVIDEND-INCOME> 1,318,583
<INTEREST-INCOME> 3,386,541
<OTHER-INCOME> 0
<EXPENSES-NET> 796,444
<NET-INVESTMENT-INCOME> 3,908,680
<REALIZED-GAINS-CURRENT> 1,228,134
<APPREC-INCREASE-CURRENT> 11,255,813
<NET-CHANGE-FROM-OPS> 16,392,627
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5,009,296
<NUMBER-OF-SHARES-REDEEMED> (4,467,960)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 24,236,098
<ACCUMULATED-NII-PRIOR> 5,845,758
<ACCUMULATED-GAINS-PRIOR> 764,258
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 731,212
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 807,558
<AVERAGE-NET-ASSETS> 222,378,341
<PER-SHARE-NAV-BEGIN> 13.88
<PER-SHARE-NII> 0.25
<PER-SHARE-GAIN-APPREC> 0.83
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.96
<EXPENSE-RATIO> 0.72
</TABLE>
