Kansas City, MO (SportsNetwork.com) - Buddy Hield scored 22 points and the 15th-ranked Oklahoma Sooners used a strong second half to beat the Oklahoma State Cowboys 64-49 in the quarterfinals of the Big 12 Conference Tournament.

TaShawn Thomas added 17 points and 10 rebounds for the third-seeded Sooners (22-9), who will face 13th-ranked Iowa State in Friday's semifinals. Jordan Woodard and Isaiah Cousins tallied 11 and 10 points, respectively.

Oklahoma outscored Oklahoma State by a 43-23 margin in the second half.

"Two different halves. Really good win, proud of our guys for hanging in there," said Oklahoma coach Lon Kruger.

Le'Bryan Nash ended with 27 points and 12 rebounds for the sixth-seeded Cowboys (18-13). Jeff Newberry contributed 10 points.

Trailing 21-19, Oklahoma State went on an 11-0 run that bridged the first and second halves. Nash went 6-of-6 from the foul line during the surge to give the Cowboys a 30-21 lead with 18:37 to play.

But the Sooners responded with an 18-5 run to take the lead for good. Hield tallied 10 points during the burst to make it 39-35 with 13:02 to play.

The score was 43-43 when Thomas threw down a dunk to spark an 18-3 Oklahoma run. Thomas and Cousins each scored six points during the game-clinching surge, which ended on two Hield free throws with 1:42 remaining.

"Our last game with them, they really took it from us in the second half. This game, we had open shots -- wide open shots," said Cowboys coach Travis Ford. "We just didn't convert."

Game Notes

The Cowboys have lost six of their last seven ... Hield went 9-of-9 from the foul line ... The Sooners did not get any points from their bench ... Oklahoma committed just six turnovers ... Oklahoma State went 3-of-21 from beyond the arc.