FORT WORTH, Texas (AP) -- Le'Bryan Nash scored a career-high 28 points, Marcus Smart had his typically strong all-around game not far from the high school where he won two state championships, and No. 15 Oklahoma State beat offensively challenged TCU 64-47 on Wednesday night.
Nash had the first two baskets in an 18-1 run that bridged the first and second halves and put the Cowboys (21-6, 11-4 Big 12) in control for good.
Smart, a freshman who won back-to-back state titles at Flower Mound Marcus High School, had nine points, five assists and three steals -- all categories in which he is among the Big 12 leaders.
Kyan Anderson led the Horned Frogs with 15 points. Devonta Abron had 12 points and nine rebounds off the bench.
TCU (10-18, 1-14), one of the lowest-scoring teams in the country, missed 12 straight shots while going more than 10 minutes without a field goal and ended up shooting 27 percent.
Playing before plenty of orange-clad fans on TCU's home court, the Cowboys won for the ninth time in 10 games and stayed within a game of Kansas and Kansas State with three games left in the race for the Big 12 regular-season title.
Nash, who played high school basketball not much farther away than Smart in Dallas, scored inside and out on his way to 12-of-16 shooting. He and Michael Cobbins each had a team-high six rebounds.
The Horned Frogs had their scoring drought a little later than when they scored just nine points in the first half of a 74-48 loss at Kansas on Saturday. TCU was playing a ranked opponent at home for the first time since knocking off the No. 6 Jayhawks on Feb. 6.
TCU's only point during Oklahoma State's 18-1 run was a free throw by Addrick McKinney late in the first half. The upset of Kansas was the only time in their first 15 Big 12 games that the Horned Frogs scored 60 points. Wednesday marked the 11th time this season that they failed to reach 50.
By the time Anderson hit a 3-pointer with 14 1/2 minutes left, Oklahoma State had a 44-24 lead.
Smart got Oklahoma State's decisive run going by hitting a 3-pointer and getting a steal that led to a layup by Brian Williams, who missed the free throw on the potential three-point play. Williams made up for it with a steal and breakaway dunk to put Oklahoma State ahead 38-24 at halftime.
Oklahoma State improved to 19-2 against the Horned Frogs, who last beat the Cowboys in 1986. The Cowboys shot 55 percent to overcome TCU's 14-3 edge in offensive rebounds.
The Horned Frogs stayed close for most of the first half, trailing 26-23 with 5 minutes left, despite hovering around 30 percent shooting, because they dominated in offensive rebounding.