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MADISON, Wis. -- Redshirt freshman forward Ethan Happ drained a game-winning, reverse layup with 10.2 seconds left as Wisconsin stunned No. 4 Michigan State with a 77-76 Big Ten Conference win on Sunday at the Kohl Center.

Junior guard Bronson Koenig scored a game-high 27 points on 8-of-16 shooting to help the Badgers (10-9, 2-4 Big Ten) snap a three-game losing streak. Junior forward Nigel Hayes added 25 points and seven rebounds.

Senior guard Denzel Valentine scored a team-high 23 points for Michigan State (16-3, 3-3), which has lost two consecutive games.

Happ, who finished with 14 points, had eight rebounds.

Senior guard Matt Costello contributed 18 points and a game-high 13 rebounds for the Spartans.

Valentine, a preseason player of the year candidate who returned three games ago from a left knee injury, was held scoreless a majority of the first half. Valentine missed five shot attempts, then drained three 3-pointers with his next three tries and scored 11 points over the final 6:38 of the first.

Michigan State coach Tom Izzo retooled the Spartans' starting lineup after the team's 16-point home loss to Iowa three days ago. On Sunday at Wisconsin, redshirt junior guard Eron Harris and freshman forward Deyonta Davis got starting nods instead of of senior guard Bryn Forbes and junior forward Gavin Schilling.

In addition, freshman Matt McQuaid got his first career start at point guard in place of sophomore Tum Tum Nairn Jr., who did not dress for the game and had a boot on his right foot.

Harris made an impact with 11 points in the first for Michigan State.

NOTES: Wisconsin has won 11 of the last 13 games against Michigan State at the Kohl Center in Madison. ... Sophomore Tum Tum Nairn Jr., the Spartans only true point guard, had a boot on his right foot and didn't play. Nairn had logged 34 straight starts and averaged 4.5 assists per game. Spartans coach Tom Izzo said during a pre-game radio interview that Nairn would be out at least two weeks with plantar fasciitis. ... Wisconsin entered the game with four Big Ten losses, losing those games by a combined nine points.