Bronson Koenig scored 18 points, and the Badgers (31-3) rallied from 11 points down in the second half in an attempt to strengthen their bid for a No. 1 seed in the NCAA Tournament.
Branden Dawson and Denzel Valentine scored 16 points each for Michigan State (23-11). But the Spartans were outscored 31-10 over the final 11 1/2 minutes of the game and came up short after winning the tournament last year.
In the first overtime in a Big Ten title game, Hayes and Koenig hit 3-pointers in the first 3 minutes to give the Badgers a 75-69 lead. Michigan State missed all six shots and committed two turnovers in the extra period.
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