Jon Diebler hit seven 3-pointers for 21 points to lead the sixth-ranked Buckeyes to a 73-57 victory over Illinois on Tuesday night at Ohio.
William Buford added 17 points, seven rebounds and five assists. David Lighty finished with 15 points to lead Ohio to win.
Illinois needs a season finale victory at home on Sunday against No. 15 Wisconsin to clinch a top-five seed in the Big Ten tournament and a first-round bye.