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(AP) -- Senior Will Clyburn scored 20 points and Iowa State beat No. 13 Oklahoma State 87-76 on Wednesday night to bolster its NCAA tournament hopes.

Georges Niang added 18 points for the Cyclones (20-10, 10-7 Big 12), who notched just their second victory over a ranked opponent.

Oklahoma State trailed by as many as 15 points, but Marcus Smart's reverse dunk made it 70-68 with 4:28 left.

Clyburn answered with a 3 and Tyrus McGee's 3 a minute later put the Cyclones ahead 78-68.

Smart was brilliant for Oklahoma State (22-7, 12-5), scoring 24 points with eight rebounds and five steals. But it wasn't enough as the Cowboys lost for just the second time in 12 games.

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