Markel Brown scored 18 points, Le'Bryan Nash added 16 and No. 15 Oklahoma State corralled Texas star Myck Kabongo to beat the Longhorns 78-65 on Saturday.
A showcase of two of the Big 12's marquee point guards ended up being a sloppy one, with Kabongo committing a career-high seven turnovers while the Cowboys' Marcus Smart had five.
Oklahoma State (22-6, 12-4 Big 12) took advantage of two of Kabongo's turnovers to score the final eight points of the first half and start an 18-2 run that carried beyond halftime. By the time it was over, the Cowboys were firmly in front at 47-33 after Nash drove through traffic for a right-handed slam.
The Longhorns (13-16, 5-11) tried to deploy their full-court press, but couldn't duplicate their comeback from a 22-point deficit in the final 8 minutes of regulation in an overtime win against Oklahoma on Wednesday night.
Oklahoma State was able to handle the pressure without much trouble, using it to create easy scoring chances.
Phil Forte grabbed a press-breaking outlet pass and hit an open 3-pointer from the left wing, and Brown converted a three-point play on the Cowboys' next possession after getting a high-arcing runner to go over the corner of the backboard and fall in. His ensuing free throw stretched the lead to 65-46 with 7:31 remaining.
The Cowboys sent two defenders at Kabongo at every chance, forcing him into mistakes or simply getting the ball out of the hands of Texas' top scorer. The Longhorns had won three of five after Kabongo returned from a 23-game NCAA suspension, and he had a career-best 31 points in the win against the Sooners in his last game.
Kabongo ended up with a season-low seven points and eight assists, missing five of his seven shots. Coach Rick Barnes decided to play his second-leading scorer, Sheldon McClellan, just 7 minutes. He did not score.
Julien Lewis returned after missing the last game with a concussion and led Texas with 15 points, hitting four of 11 from 3-point range. Javan Felix scored 13 points.
Forte ended up with 14 points, and Smart had 11 points, four steals and three assists. Oklahoma State swept the regular-season series against Texas for the first time since 2004. The Cowboys had lost 11 of 12 to Texas before winning three straight.
The Longhorns got two early 3-pointers from Ioannis Papapetrou and opened a 15-7 lead after Felix's steal and fast-break layup, but Nash came up with the next six points to get Oklahoma State right back in it. Smart didn't score for the first 16 minutes, but then had a three-point play and two more free throws during the 8-0 run to close the first half and put the Cowboys up 37-31.