STILLWATER, Okla. (AP) -- Michael Cobbins blocked a shot then Markel Brown converted a fast-break layup with two-tenths of a second left in overtime, lifting No. 22 Oklahoma State over Baylor 69-67 on Wednesday night.
Marcus Smart scored 14 points and Brown added 13 for Oklahoma State (16-5, 6-3 Big 12 Conference), which blew a 14-point lead in the final 7:40 of regulation and twice trailed by three points in overtime before extending its winning streak to four games.
Baylor (14-8, 5-4) had a chance to win in the final seconds of overtime, but Cobbins blocked a shot attempt by A.J. Walton under the basket, then Brown raced to the other end and made the winning layup. Brown intercepted a desperation inbound pass by Baylor's Jacob Neubert to end the game.
Oklahoma State hasn't lost since falling to Baylor on Jan. 21 in Waco, Texas. The Cowboys' streak includes a road win on Saturday at No. 2 Kansas, an effort that vaulted Oklahoma State back into the Top 25.
Baylor lost its third straight game, its longest losing streak six dropping six straight in 2009. Pierre Jackson, the Big 12's leading scorer, had 24 points, 16 of those in the game's final 12 1/2 minutes. The Bears had won three straight and eight of their last 12 games against Oklahoma State before Wednesday.
The Cowboys went 9-of-30 from the field before halftime. They trailed 32-28 when Le'Bryan Nash, who had gone scoreless in the first half, made his second basket in the first three minutes after halftime.
That ignited a 12-2 run, capped by an alley-oop dunk, with Smart lobbing to Brown with 13:40 left to make it 40-34 and igniting a roar from the Gallagher-Iba Arena crowd.
Oklahoma State extended its lead to 54-40 on a 3-pointer by Phil Forte with 7:40 left - the Cowboys' first of the game. But Jackson had two 3s and a layup during a 17-3 run by the Bears. Cory Jefferson hit a lay-in with 1:52 left to tie the game at 57.
Smart, who went 4-of-21 from the field, hit a 6-foot leaner with 1:23 left to put the Cowboys back ahead, but Jackson made two free throws with 6.5 seconds left. The Cowboys had a chance to win at the regulation buzzer, but Brown missed a 3-point attempt from the left wing.
Jackson opened overtime with a pair of 3-pointers and the Bears were up 67-64 after a dunk by Jefferson with 1:46 left. Forte's 3-pointer with 1:11 left pulled the Cowboys even.
Jackson dribbled the ball out of bounds with 43.5 seconds left, but Smart missed a contested shot from underneath the basket with 15 seconds left, setting the stage for the final sequence.
Nash scored 10 points and Cobbins had nine points, 13 rebounds and two blocks for the Cowboys.
Jefferson added 18 points for Baylor.