STILLWATER, Oklahoma (Ticker) -- Joey Graham may not be one of college basketball's biggest surprises anymore.
Graham scored six of his career-high 36 points in overtime as seventh-ranked Oklahoma State held off a spirited effort from Nebraska for an 87-83 Big 12 Conference victory.
Oklahoma State (21-2, 11-1 Big 12) extended its winning streak to 11 games, despite a major scare. The Cowboys did it, thanks to Graham, a Central Florida transfer who was considered an afterthought in the rugged Big 12.
"I do not think I have ever had a hot streak like that," said Graham, who made 12-of-19 shots. "I was just feeling it tonight."
Two free throws by Graham with less than 90 seconds to go in overtime gave the Cowboys an 84-83 lead. After Nebraska's Nate Johnson missed a shot, Ivan McFarlin sank a pair at the line for Oklahoma State for a three-point edge with 22 seconds to go.
The Cornhuskers (14-9, 4-8) had one final chance to tie, but a 3-point attempt by Marcus Neal Jr. was no good. Graham added a free throw for the final margin.
Graham's output was the most by a Cowboy since a 45-point explosion by Randy Rutherford against Kansas on March 5, 1995.
"He played unbelievable," Oklahoma State guard John Lucas said. "You never know who is going to step up. Tonight was his night, and he stepped up in a big way."
The Cowboys looked like they had the game in hand in regulation when Lucas drilled a 3-pointer for a 73-68 advantage with 25 seconds to go. But Neal nailed a 3-pointer and, after Oklahoma State's Tony Allen split a pair at the line, Nate Johnson's three-point play with seven seconds left forged a 74-74 tie.
"We feel like we have been drug through a knothole," Nebraska coach Barry Collier said. "We are really disappointed that we weren't able to win with the game being such a highly intense game."
Oklahoma State, which improved to 13-0 at home, retained sole possession of first place in the Big 12. The Cowboys lead Texas by one game.
Graham finished with 30 points after halftime, drilling shot after shot. The muscular 6-7 forward did most of his damage inside, although he also stepped outside to drain all three 3-point attempts, creating a very difficult matchup.
"He was shooting the ball so well we put in isolation plays for him," Oklahoma State coach Eddie Sutton said. "He just had a sensational night."
"I feel like I give up a lot of size in the post, but they give up a lot of speed," Graham said. "I think I take advantage of that."
Nebraska showed early that it would be competitive, leading by as many as six points in the first half. Oklahoma State recovered to take a 31-28 halftime lead and neither side led by more than seven points in a tense second half.
Andrew Drevo scored 21 points to lead the Cornhuskers, who fell to 2-6 on the road.