Withey also grabbed six rebounds and blocked there shots for the Jayhawks (23-4, 11-3 Big 12), who notched a fourth straight and got payback for a Feb. 6 upset staged by TCU.
Ben McLemore supplied 14 points while Perry Ellis and Travis Releford scored 12 points apiece for Kansas.
The Horned Frogs (10-17, 1-13) were paced by Abron Devonta's 18 points and nine rebounds.
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