Isaiah Austin scored 18 points and Baylor held on after blowing most of a 21-point lead for a 78-73 victory over No. 17 Oklahoma on Thursday night in the Big 12 tournament quarterfinals.
Cory Jefferson added 14 points and 11 rebounds for the No. 7 seed Bears (23-10), who became the first lower-seeded team to win in this year's tournament. They advanced to face the winner of Texas-West Virginia in the semifinals on Friday night.
Cameron Clark scored 19 points and Buddy Hield had 15 for the second-seeded Sooners (23-9), who spent most of the second half frantically rallying from a 52-31 deficit.
They got within 72-68 on Hield's 3-pointer with 1:27 left, and had a chance to get even closer when Royce O'Neale turned it over for Baylor. But a 3-pointer by Jordan Woodard with about a minute left was off the mark, and O'Neal came through with a pair of free throws.