UC Irvine is seeded first and USC second in the NCAA men's volleyball Final Four that will be played Thursday and Saturday at the Galen Center.
Irvine (24-5) earned the top seeding by winning the Mountain Pacific Sports Federation tournament championship with a five-set victory over Stanford on Saturday night.
The Anteaters defeated top-ranked USC, the MPSF regular-season champion, in five sets in the semifinals, ending the Trojans' 18-match winning streak.
Irvine will play one semifinal against Penn State (23-5), the winner of the Eastern Intercollegiate Volleyball Assn.
USC (23-5) will play Lewis University (26-6), which defeated Ohio State to win the Midwestern Intercollegiate Volley Assn. tournament.
The NCAA committee chose USC over Stanford and Brigham Young for the at-large berth.