Ben Brust scored 19 points and No. 4 Wisconsin remained unbeaten with a 75-71 victory over No. 22 Iowa on Sunday night.
Wisconsin (15-0, 2-0 Big Ten) matched the best start in school history, tying the 1911-12 and 1913-14 teams.
The game was physical at times, drawing loud protests from both coaches. Iowa coach Fran McCaffery was ejected with 12 minutes to play after two technical fouls were called.
Roy Marble led Iowa (12-3, 1-1) with 27 points.