<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from MML
form N-SAR for the period ended June 30, 2000
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 4
<NAME> MML Blend Fund
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> JUN-30-2000
<INVESTMENTS-AT-COST> 1,724,607,121
<INVESTMENTS-AT-VALUE> 2,170,252,668
<RECEIVABLES> 37,381,405
<ASSETS-OTHER> 50,314
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 2,207,684,387
<PAYABLE-FOR-SECURITIES> 11,495,439
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 108,415,832
<TOTAL-LIABILITIES> 119,911,271
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,461,678,548
<SHARES-COMMON-STOCK> 90,108,842
<SHARES-COMMON-PRIOR> 112,151,790
<ACCUMULATED-NII-CURRENT> 18,169,858
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 162,279,163
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 445,645,547
<NET-ASSETS> 2,087,773,116
<DIVIDEND-INCOME> 15,074,899
<INTEREST-INCOME> 29,699,488
<OTHER-INCOME> 0
<EXPENSES-NET> 4,438,796
<NET-INVESTMENT-INCOME> 40,335,591
<REALIZED-GAINS-CURRENT> 162,473,031
<APPREC-INCREASE-CURRENT> (225,642,995)
<NET-CHANGE-FROM-OPS> (22,834,373)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (22,216,285)
<DISTRIBUTIONS-OF-GAINS> (193,868)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,446,320
<NUMBER-OF-SHARES-REDEEMED> 28,534,080
<SHARES-REINVESTED> 4,044,812
<NET-CHANGE-IN-ASSETS> (548,547,720)
<ACCUMULATED-NII-PRIOR> 50,552
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 4,324,395
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,438,796
<AVERAGE-NET-ASSETS> 2,356,088,495
<PER-SHARE-NAV-BEGIN> 23.51
<PER-SHARE-NII> 0.42
<PER-SHARE-GAIN-APPREC> (0.54)
<PER-SHARE-DIVIDEND> (0.22)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 23.17
<EXPENSE-RATIO> 0.38
</TABLE>
