Andrew Wiggins scored 30 points, Wayne Selden Jr. had 14 and No. 10 Kansas pulled away in the final seconds of overtime for a 77-70 victory over Oklahoma State in the quarterfinals of the Big 12 tournament.
Naadir Tharpe made four foul shots in the extra session to seal the victory for the top-seeded Jayhawks (24-8), who will face fourth-seeded Iowa State in Friday night's semifinals.
The No. 16 Cyclones, behind a big game from Melvin Ejim, beat No. 5 seed Kansas State 91-85.
Phil Forte briefly gave the Cowboys a 70-68 lead with a 3-pointer a minute into overtime, but the Jayhawks scored the final seven points, all but two of them coming at the foul line.
Le'Bryan Nash scored 19 points to lead the Cowboys (21-12). Forte added 16 points and Marcus Smart finished with 14, though he missed all three of his shots in the extra session.