Justin Cobbs scored 22 points, 15 in the second half and seven in overtime, as California held off Washington State's 3-point barrage, 80-76 on Wednesday night.
Cobbs' three-point play put Cal up 69-67 with 26 seconds left in regulation before DaVonte Lacy hit two free throws for Washington State to send the game into overtime.
Cobbs made 5 of 6 free throws in overtime and ended the game with a dunk at the buzzer.
Richard Solomon added 15 points for California (16-8, 7-4 Pac-12) before picking up his fifth foul with less than a minute gone in overtime.
DaVonte Lacy scored a career-high 39 points, including eight 3-pointers, for Washington State (9-15, 2-10). D.J. Shelton added 18 points and a career-high 19 rebounds.
The Cougars made nine 3-pointers in the second half and didn't make a two-point basket, after halftime, until the 6:11 mark.