Waco, Texas ? Tony Allen bounced back big from his lowest-scoring game of the season for No. 13 Oklahoma State.

Allen scored 17 points, the last by converting a three-point play with 38.6 seconds left in overtime after he forced a turnover, and the Cowboys extended the nation’s longest winning streak to 13 games with a 67-64 win over Baylor on Tuesday night.

“We ran two special plays for him when he hit those baskets in regulation,” Cowboys coach Eddie Sutton said. “In overtime when they got in a zone and he drove, that’s just pure talent. He’s got a chance to be a very good basketball player.”

The Cowboys (15-1 overall, 4-0 Big 12 Conference) blew a 10-point lead in the second half but managed to pull out the win after Allen took a pass from Melvin Sanders and made a nifty move along the baseline and through traffic for the go-ahead layup. He added the free throw to make it 66-64.

Allen set up the possession when he forced freshman Corey Herring into a turnover.

After scoring just seven points in a 76-56 win Saturday over then-No. 11 Missouri, Allen made eight of 13 shots. The junior-college transfer is the team’s leading scorer at 16 points per game.

Sutton doesn’t allow Allen to talk to reporters after games. For now, Allen’s play will have to do the talking, and it spoke volumes against the Bears.

“When we needed the big play, Tony made it,” said Ivan McFarlin, who added 16 points and 10 rebounds for the Cowboys.

Baylor (9-6, 0-4) had one more chance, but with the shot clock winding down and Allen in his face, Terrance Thomas couldn’t get off a desperation shot with 2.5 seconds left. Victor Williams then hit a free throw after being fouled on the inbounds pass.

Lawrence Roberts had 21 points and 17 rebounds for Baylor, forcing overtime when he made a three-pointer with nine seconds left in regulation.

Roberts scored the Bears’ only points in overtime, stealing a pass from Williams and driving for a layup and scoring on a tip-in.

Oklahoma State's Andre Williams, top, reaches for a loose rebound over Baylor's R.T. Guinn. OSU beat the Bears, 67-64 in overtime, on Tuesday in Waco, Texas.

After Sanders hit a three-pointer to put Oklahoma State ahead, Roberts had his tip-in with two minutes left to put Baylor ahead 64-63. But the Bears didn’t score again.

Two missed three-pointers by the Cowboys and two turnovers by Baylor set up the winning sequence.

“We made a lot of good plays, and our players have played a lot of good basketball over the past four games, but not good enough to win in the Big 12,” Baylor coach Dave Bliss said.

No. 21 Missouri 64, Iowa State 59

Columbia, Mo. — Ricky Clemons, coming off a one-game suspension, found his scoring touch just in time to lead a late spurt as Missouri beat Iowa State. Clemons, a junior point guard who leads the Tigers with a 17-point average, was reinstated Monday after being charged last week with choking a 20-year-old woman.

He shot 5-for-19 and missed a handful of wild layup attempts. He finally started connecting in the closing minutes, scoring six of his 15 points in a 13-0 run that put Missouri, once down by three, ahead 60-50 with 2:45 to go.

Clemons was the first Missouri starter introduced and got a thunderous round of applause just like the rest of his teammates. He is charged with second-degree domestic assault and is scheduled to appear in court Jan. 29. He’ll likely play the rest of the season with the Tigers before the case could go to trial.