The second-ranked Bruins (40-12 overall, 21-6 in conference play) have won or shared the title three of the last five seasons.
UCLA wiped out a 2-0 deficit with a four-run fifth inning. Stephens’ two-run single tied the score before Keck singled to center for a 4-2 lead.
Cody Poteet pitched 1 2/3 innings in relief for the victory. He has a 5-1 record on the season. David Berg went 1 2/3 innings for his 12th save.
UCLA also won the Pac-12 title in 2011 and 2012.