Senior opposite Carson Clark led the winners with 16 kills and a .577 hitting percentage.
Junior outside hitter Kevin Tillie added 13 kills, eight digs and two block assists for UCI, which posted a 9-5-3.5 edge in team blocks.
UCI plays host to No. 9-ranked Long Beach State on Friday at 7 p.m.
Orange Coast def. Santa Monica
COSTA MESA — Chris Van Vuuren had 12 kills and Dillon Emery added 10 for the host Pirates in the nonconference match Wednesday.
The game scores were 25-17, 25-19, 25-17, as OCC improved to 3-2 and dropped the Corsairs to 3-4.
Michael Ensign had 33 assists for OCC, which concludes nonconference play at Long Beach on Friday at 6 p.m.
Cal State Los Angeles 8, Vanguard 1
COSTA MESA — Gabriela Bergmanova defeated Christie Lau, 6-3, 7-5, at No. 1 singles to record the lone victory for the host Lions in the nonconference match Wednesday.
Vanguard, ranked No. 11 in the NAIA, is 2-3, while Cal State L.A., an NCAA Division II school, is 5-3.