Moorpark 83, Southwestern 72--Dan Galvanoni led six Moorpark players in double figures in a first-round game.
Galvanoni finished with a team-high 17 points.
The No. 5-seeded Raiders (24-7) got key production from reserve forward Bryan Smith, who scored nine of his 11 points in the first half.
Moorpark will host No. 12 seeded Irvine Valley (21-10) on Wednesday night.
Southwestern finished 14-16.