STILLWATER, Okla. (AP) — Marcus Smart scored 28 points, Le’Bryan Nash added a season-high 26 and No. 16 Oklahoma State beat Oklahoma 84-79 in overtime Saturday for its third straight down-to-the-wire win at home.

Smart fed Nash for a right-handed slam with 53 seconds left in overtime to put the Cowboys (19-5, 9-3 Big 12) up 80-79, and Oklahoma couldn’t come up with an answer. Markel Brown’s steal led to a fast-break layup by Michael Cobbins, and Smart blocked Steven Pledger’s attempt at a tying 3-pointer to give Oklahoma State the ball back with 18 seconds to go.

BOX SCORE: No. 16 Oklahoma State 84, Oklahoma 59 (OT)

HIGHLIGHTS: How the top 25 fared Saturday

Smart sealed it with two free throws, and Cowboys fans stormed the court after OSU won its seventh straight game. Oklahoma State’s last two home wins were by two points apiece.

Romero Osby led the Sooners (16-8, 7-5) with 18 points and 15 rebounds. Sam Grooms had a career-best 18 points.

In a sharply played game in which both teams finished in single digits in turnovers, Oklahoma State squandered an early 11-point lead and then had to rally back from 11 points down in the second half.

Nash also had a right-handed slam and a three-point play off a layup in overtime to lead the way for the Cowboys, who came into the game in a three-way tie for first place in the Big 12 with No. 10 Kansas State and No. 14 Kansas. Oklahoma had been just a game back, and the anticipation of the game attracted the first Bedlam sellout in Stillwater in five years.

It was Oklahoma State’s second sellout of the season, and the first one involved a few thousand tickets being given away after a donation from booster T. Boone Pickens. The last capacity crowd of 13,611 to come to Gallagher-Iba Arena without a free ticket promotion was in January 2011, when the school marked the 10th anniversary of a plane crash that killed 10 men associated with the basketball team.

The Cowboys wiped away an 11-point deficit to tie it at 56, then fell behind by … [For more on No. 16 Okla. State slips past rival Oklahoma in overtime, click here.]