Thomas tied a career high with the performance, in which he connected on a trio of 3-pointers as the Buckeyes (3-0) won the tournament's Naismith Bracket.
Aaron Craft had 18 points in Ohio State's win.
The Huskies (2-2) were led by C.J. Wilcox with 18 points.
Abdul Gaddy provided 15 for Washington, which was coming off Saturday's 84-73 overtime victory over Seton Hall.
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