Ross totaled nine points and six rebounds as the Buckeyes (20-6, 7-6 Big Ten) notched a fourth win in five games.
Marc Loving provided eight points in a reserve role.
The Fighting Illini (14-12, 3-10) got 13 points from Tracy Abrams in falling for the 10th time in 11 contests.
Rayvonte Rice put in 11 points.
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