Derrick Walton's 3-pointer with 1.3 seconds left in regulation tied the game at 57, but the Badgers never trailed in the extra session. Kaminsky opened the scoring in overtime with a three-point play, and a 3-pointer by Josh Gasser put the Badgers (18-2, 6-1 Big Ten) ahead by six.
Michigan (12-8, 5-3) is without standout guard Caris LeVert, who is out for the season following foot surgery, but the Wolverines pushed Wisconsin throughout with an inspired effort. The Badgers led by 11 in the second half before Michigan rallied.
Sam Dekker scored 15 points for Wisconsin.
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