updated 10:11 p.m. ET March 8, 2007

LOS ANGELES - On the losing end twice against UCLA after owning first-half leads, California nearly let it happen again. This time, the Golden Bears got an extra five minutes and finished off the Bruins.

Ayinde Ubaka scored eight of his career-high 29 points in overtime and California stunned fourth-ranked UCLA 76-69 in the Pac-10 tournament quarterfinals Thursday night.

“We fought too hard to give this one back,” Cal coach Ben Braun said. “We were frustrated that we had two games with pretty good leads and lost.”

UCLA’s second straight defeat dealt a serious blow to its hopes of being a No. 1 seed in next week’s NCAA tournament.

“I don’t even care,” UCLA coach Ben Howland said. “If we don’t play better than we’re playing right now, anyone in the field of 64 teams will beat us.”

Overtime turned into a blowout, with Cal outscoring the Bruins 15-8.

The game was a rematch of last year’s Pac-10 title game, won by UCLA on its way to a runner-up finish in the national championship game.

Ryan Anderson added 18 points for the eighth-seeded Bears (16-16), who gave up a 16-point first-half lead.

“This is what I’m going to remember (from) my freshman year,” said Anderson, who had a career-high 27 points in a 70-51 opening-round win over Oregon State.

Ubaka, a senior guard, encouraged his teammates to keep the upset in perspective, with No. 16 Oregon waiting in Friday’s semifinals. The teams split their two meetings this season.

“This is great, but we have another game tomorrow,” he said. “Oregon doesn’t care that we won this game.”

Darren Collison had 20 points, Josh Shipp 19 and Luc Richard Mbah a Moute 13 for the top-seeded Bruins (26-5), who lost their regular-season finale at Washington.

“It’s a definitely disappointing way to end the season,” said a glum-looking Shipp, who hit five 3-pointers in the first half. “We had a couple of mental mistakes.”

UCLA’s Arron Afflalo, the Pac-10’s player of the year, had his worst offensive performance of the season with three points, ending a streak of 29 games in double figures.

“It’s hard to swallow, that’s for sure,” he said. “It’s going to be a long week. The way I played tonight was a majority of the reason why we lost.”

Free-throw shooting, a persistent problem for the Bruins, did them in, too. They were 15-of-29 from the line, while Cal hit 20-of-25.

Ubaka tied the game at 59 on a 3-pointer after a wild scramble with 54 seconds left in regulation. Collison drove the lane and scored to put the Bruins in front until Ubaka’s floater with 15 seconds left forced overtime.

“We know he goes right, the scouting report says he goes right and he did exactly that and made a great shot,” Howland said. “Ubaka absolutely dominated the game.”

Collison couldn’t answer again when his 3-pointer missed in the closing seconds.

“I thought we had momentum going into overtime,” he said. “We spent so much energy coming back.”

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