Christian Watford has 15 points as Indiana leads No. 25 Michigan State 43-40 at halftime.
The Hoosiers were the more physical team for much of the half, accounting for the 19-13 edge in rebounding.
The Hoosiers led by 12 after Matt Roth made consecutive three-pointers with 11:42 to go in the half.
IU is shooting 53.8 percent from the floor.
Draymond Green leads Michigan State with 10 points. He sparked a 12-0 run that got the Spartans back in the game.