Kansas will face 14th-ranked Texas in Sunday's championship game.
Julian Wright added 12 points and eight rebounds for the Jayhawks (29-4) won their 10th straight game.
Guard Brandon Rush, who leads Kansas in scoring, made only 3-of-10 shots Saturday and finished with eight points.
Cartier Martin scored 17 points and Lance Harris 16 for Kansas State (22-11).
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