Crabbe was 10 for 15 shooting, including 4 for 6 on 3-pointers, and made a pair of shots in the extra period to help the Golden Bears (9-7, 2-2 Pac-10) run away with the victory in overtime after blowing a 14-point lead.
Pac-10 scoring leader Klay Thompson had another brilliant offensive night with 36 points and DeAngelo Casto added 11 for the Cougars (12-5, 2-3), who dropped their third straight conference road game. They also lost at UCLA and USC.
Thompson's 3-pointer in the waning seconds of regulation forced overtime. But Cal sprinted out to a six-point lead in the extra period that was too much for Washington State to overcome.
Colorado State graduate transfer John Gillon has chosen Syracuse, giving the Orange a potential starter at point guard entering the 2016-17 season.
DeSean Murray, who averaged 20.2 points as a sophomore at Presbyterian, will transfer to Auburn to play for coach Bruce Pearl.
Former Kentucky guard Ed Davender, the only Wildcat with at least 1,500 points and 400 assists, has died. He was 49.