Senior Ally Carda had a bases-clearing double and tied a career high in strikeouts with 11.
Stephany LaRosa, Gabrielle Maurice and Brittany Moeai all had two-hit games for the Bruins.
UCLA had a dozen hits and two freshmen were in command in the circle in a win over the Thunderbirds.
UCLA benefited from six errors in Friday's opening win, but made three in the nightcap in a loss.
UCLA plays Friday and Saturday in Lakewood and Sunday at Long Beach State.