Zeller also hauled down 10 rebounds while Yogi Ferrell provided a career-high 19 points for the Hoosiers (25-4, 13-3 Big Ten), who were coming off a 77-73 loss at Minnesota.
Victor Oladipo donated 10 points and eight boards as Indiana increased its Big Ten Conference lead to 1 1/2 games with contests against Ohio State and Michigan remaining.
The Hawkeyes (18-11, 7-9) were led by Roy Devyn Marble with 20 points.
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