CORVALLIS — Once California's Justin Cobbs got a couple shots to drop, his confidence soared and Oregon State's lead vanished.

CORVALLIS — Once California's Justin Cobbs got a couple shots to drop, his confidence soared and Oregon State's lead vanished.

Cobbs, held scoreless in the first half, scored 20-second half points and finished with nine assists as the Bears rallied from a 10-point halftime deficit to defeat the Beavers 88-83 Saturday.

Tyrone Wallace had 17 points and Richard Solomon added 15 points and eight rebounds to help the Bears (12-4, 3-0 Pac-12) sweep the Oregon schools on the road for the second consecutive season.

Roberto Nelson led all scorers with 26 points and nine assists for the Beavers (9-7, 1-3), who shot 63 percent from the field in the first half to open a 45-35 lead, but cooled off in the second.

With road wins over Stanford and Oregon, the Bears are 3-0 in league play for the first time since 2009 and did so without injured guards Jabari Bird (hand) and Ricky Kreklow (ankle), who remain sidelined indefinitely.

"Depth could have really hurt us tonight, because we were obviously tired to start with," Cal coach Mike Montgomery said. "Nobody was making shots early. The second half, guys started making shots."

Cobbs, who went 0 for 4 from the field in the first half, scored seven of Cal's first 15 points in the second half, including a 3-pointer that pulled the Bears within 52-50 with 15:19 to play.

"Sometimes the ball just doesn't go in," Cobbs said. "That's what happened to me in the first half. I'm just happy I didn't put my head down and I was able to get it going."

Cobbs made 6 of 9 shots from the field and 7 of 8 free throws in the second half.

"I was more confident. Ask any basketball player, once you see the ball go down for you once or twice, you get a little more confidence going."

Wallace dunked to give Cal the lead for good, 62-61, and then Jeff Powers hit a 3-pointer, Cobbs made two free throws, Powers hit again from long range, and Christian Behrens scored on a layup to extend the lead to 72-61 with 6:40 remaining.

The Bears maintained at least a five-point lead the rest of the way.

"I thought we played a great first half," Beavers coach Craig Robinson said. "In the second half, Cal went on a little bit of a run and we started going away from what got us to where we were.

"Not maliciously, but each guy thought, 'I can help us get this back by doing my own thing,' and that ended up sinking us."

David Kravish finished with 16 points and Powers had 14 off the bench for the Bears, who shot 54.8 percent (17 of 31) from the field in the second half and 51.7 percent (31 of 60) for the game.

"To win at Stanford, at Oregon, and at Oregon State, that's going to be a challenge for somebody else," said Montgomery, who registered career win No. 668 to tie former Maryland coach Gary Williams for 27th on the NCAA's Division I all-time wins list. "Now, we've got to go back home and get the crowd and get the energy off that."

Angus Brandt score 22 points and Eric Moreland added 14 points and 11 rebounds for the Beavers, who shot 50 percent (27 of 54) for the game after shooting 63 percent (17 of 27) in the first half.