Sam Dekker came off the bench to score 13 for Wisconsin (18-8, 9-4 Big Ten), while Traevon Jackson added 10.
DeShaun Thomas led the Buckeyes (18-7, 8-5) with 18 points, and Sam Thompson had 10.
The win kept Wisconsin tied with Michigan for third in the conference, two games behind leaders Indiana and Michigan State. Ohio State dropped into fifth place.
Wisconsin put Ohio State in a hole early and never let the Buckeyes climb out of it.
The Badgers took control with an 18-0 run in the first half that lasted more than 7 minutes and put them up 24-6. While Wisconsin was a model of efficiency on offense, the Buckeyes started the game 3 for 18 and could not get into a rhythm.
