The second-ranked Bruins (39-12, 20-6) moved a step closer their third title in five seasons with a 6-0 victory over the Wildcats on Saturday. Grant Watson pitched seven shutout innings for his 30th career victory, moving him into second behind Trevor Bauer's 34 wins on the school's all-time list.
UCLA won the Pac-12 title in 2012 and 2011. The Bruins won the national championship in 2013.
Watson (8-4) allowed four hits and struck out six. The Bruins have shut out the Wildcats, the Pac-12's top-hitting team, all 19 innings through the first two games of the series. James Kaprielian and David Berg combined to no-hit Arizona on Friday.
Brett Stephens had three hits and drove in a run. Ty Moore has a bases-empty home run, his sixth homer of the season, to break a scoreless tie in the fourth inning.