Indiana leads Wisconsin 32-31 at halftime Tuesday at Assembly Hall.
Cody Zeller had a big half, scoring 18 points for the No. 2 Hoosiers. Zeller was 8 for 8 from the floor. The rest of the Hoosiers were just 5 of 20.
But Christian Watford made a three-pointer with 20.8 seconds left in the half to give IU the lead.
Victor Oladipo has five points for the Hoosiers.
Ryan Evans and Frank Kaminsky each have six points for the Badgers.