Tyson Leighton went three for five with three runs batted in in the opener, including a home run and a triple.
Gabriel Garcia pitched six shoutout innings, allowing one hit, in the seven-inning finale to improve to 7-4.
Mike Leal and Robert Purpura posted saves for the Lions.
La Sierra is 12-20.
Orange Coast 385, Riverside 391
RIVERSIDE — Sophomore Matt Parkovich earned medalist honors after shooting two-under-par 70 in the Pirates' Orange Empire Conference match at Victoria Club Wednesday.
Josh Hurst and Jeff Fuzzard each finished with 78s for OCC (12-2 in conference).
Mike Squillace had a 79 and Lyon Lazare an 80.