Cezar Guerrero scored all 16 of his points in the second half for Oklahoma State (15-17), which advanced to play second-seeded No. 5 Missouri in the quarterfinals Thursday night. Markel Brown finished with 12 points as the Cowboys went 16 of 16 from the free-throw line.
Jordan Tolbert had 16 points and six rebounds for Texas Tech, which matched a school record for the most losses in a single season. The 1990-91 team coached by Gerald Myers also went 8-23.