A Payne County jury found an OSU basketball player Darrell Williams guilty of sexual battery and rape by instrumentation.
Williams was convicted on 3 of the 5 counts against him.
Prosecutors say Williams attacked 2 women at a party in December 2010.
Both women identified Williams as their attacker after police showed them a photo of the Cowboys basketball team.
Witnesses say several players wore similar warm-up suits to the party that night. His defense team says that may have led to a misidentification.
He was suspended in February 2011. Before that, he led the team in rebounds and averaged 7.1 points per game.
Williams faces up to 25 years in prison.