DALLAS (Ticker) -- Joey Graham scored a season-high 25 points and John Lucas added 23 as seventh-ranked Oklahoma State defeated Iowa State, 83-75, in the quarterfinals of the Big 12 Conference tournament.
Oklahoma State (25-3) blew an 11-point halftime lead before pulling away for its fourth straight win. Tony Allen contributed 15 points and Ivan McFarlin 12 for the Cowboys, who shot better than 57 percent (31-of-54).
Graham tied the Big 12 tournament record for shooting percentage by going 11-of-13 from the field. He also had nine rebounds. McFarlin grabbed six boards, despite picking up his fourth foul early in the second half. The Cowboys were outrebounded, 38-32.
"Individually, we're always concerned about picking up our fifth foul, but we have so many players on the bench and so much depth that we could just put anybody in at any moment," Graham said. "We weren't worried about fouling out or anything like that."
Jackson Vroman had 24 points and 10 rebounds and Jake Sullivan scored 19 points for Iowa State (17-12), which lost for the fifth time in eight games.
"I thought it was a great game. Both teams played really hard," Iowa State coach Wayne Morgan said. "I am extremely proud of the effort and growth my team has shown over the course of the year. Our kids in this tournament played as hard as they could and tried as hard as they could, and I think that's all you can ask from anyone."
Jared Homan had 13 points and 13 rebounds for the Cyclones, who collected 17 offensive rebounds and scored 22 second-chance points.
"It was mostly because we didn't block off very well," said Oklahoma State coach Eddie Sutton, who turned 68 on Friday. "Their dribble penetration was a factor."
The Cyclones used a 12-3 surge to close within 53-52 on a jumper by Homan with 10:08 remaining.
"We knew they would make a late surge, but we just had to keep shooting and stay focused," said Lucas, who made his final three shots after a 3-of-11 start. "We knew that if we stayed together as a team, like we have all year, we would come out on top."
Iowa State forged the only tie of the second half when Marcus Jefferson dunked to make it 59-59 with 7:44 remaining. The Cyclones had a chance to take the lead after Daniel Bobick missed a jumper, but Allen stripped Jefferson and fed Lucas, who completed the fast break with a dunk with 6:53 left.
That basket ignited a 13-4 surge that was capped by McFarlin's layup for a 72-63 lead with 4:03 remaining. Iowa State got no closer than five points thereafter.