Stillwater, OK (SportsNetwork.com) - Marcus Smart scored 20 of his 21 points in the second half, including two key baskets in the final minute as Oklahoma State upset No. 5 Kansas 72-65 on Saturday night.
The Cowboys (19-10, 7-9 Big 12) are 3-0 since Smart returned from a three-game suspension, having lost the previous seven in a row.
"Marcus struggled a lot, but then he made a lot of big plays," Oklahoma State head coach Travis Ford said of Smart. "After the game, I told him he's a piece of work. You have to stick with him, because he's going to make plays."
They bolstered their NCAA tournament chances with Saturday's win, ending the game with a 30-13 run in the last 10 minutes.
After Andrew Wiggins' pull-up jumper tied the game at 64-64 with two minutes left, Kansas scored only one more point. Kamari Murphy muscled in for a tough bucket at the other to give Oklahoma State the lead for good.
Wiggins then missed a layup after getting a long offensive rebound and, after a timeout, Smart split the defense through the lane for a physical layin to make it 68-64 with 46 seconds left.
Oklahoma State beat the press after a Kansas free throw and Smart took it to the basket again for a five-point lead with 23.8 seconds left. Wiggins missed a 3 at the other end, and Markel Brown cinched the win for Oklahoma State with two free throws for the last of his 19 points.
"We stopped getting stops," Kansas forward Perry Ellis said when asked what happened down the stretch. "We weren't playing good defense and that was the key to getting more stops."
Wiggins had 15 points to lead the Jayhawks (22-7, 13-3), who had a four-game winning streak snapped. Wayne Selden Jr. and Joel Embiid added 13 points each in the loss and Embiid had 13 rebounds.
In the first meeting between the teams this season on Jan. 18 in Lawrence, then-No. 15 Kansas nearly blew a 19-point lead but held on for an 80-78 win over the Cowboys, who were ranked ninth at the time.
Kansas led 26-25 at halftime in this one and by as many as 10 points before Oklahoma State's run.
Le'Bryan Nash scored 16 points for the Cowboys ... Oklahoma State has two regular-season games remaining against Kansas State and Iowa State ... Kansas' last regular-season games are against Texas Tech and West Virginia.