Cal waited until the final day of the year to play its best half of basketball.

The Golden Bears turned a one-point halftime lead against UCLA into a New Year's Eve matinee rout, roaring to an 85-69 victory in front of 9,750 delighted fans at Haas Pavilion.

"We just were tuned in," Cal coach Mike Montgomery said. "It was fun to watch."

The final margin of victory was the largest by Cal over the Bruins since a 92-63 win at Berkeley on Feb. 1, 2001.

Cal outscored the Bruins 37-14 over the first 141/2 minutes to complete its first weekend home sweep of the Los Angeles schools in eight seasons.

The Bears (12-3, 2-0 Pac-12) played selflessly on offense and smothered the Bruins (7-7, 0-2) with their defense to stay atop the conference standings after the first weekend of the league schedule.

Cal led by as many as 24 points midway through the second half and shot 65.4 percent for the game. The Bears' 28 assists (on 34 baskets) were the most they've had in a game since getting 30 against Long Beach State on Dec. 28, 2007.

"As far as that second half, it might be the best half we've ever played in terms of executing our offense, getting stops, and we maintained throughout the whole half," point guard Justin Cobbs said. "That was really impressive to me."

The Bears had 16 assists and just one turnover in the second half.

Allen Crabbe led the Bears with 20 points, including four 3-pointers, and had six assists and five rebounds.

Jorge Gutierrez added 16 points and eight assists and held UCLA's Lazeric Jones to 2-for-7 shooting and five points -- 21 fewer than he had two nights earlier at Stanford.

"Jorge sets the tone," Montgomery said. "If you can take the head off the snake, it makes it difficult."

Cobbs had 13 points and eight assists, as the Bears' three perimeter players combined for 22 assists and just four turnovers.

Montgomery said he felt like apologizing when he told 6-foot-9, 205-pound freshman David Kravish that he would be defending the 6-10, 315-pound Joshua Smith.

"The kid is unfazed," Montgomery said. "He just plays."

Kravish scored a career-high 13 points on 6-for-7 shooting and helped limit Smith to six points and four rebounds. The Bears doubled-teamed Smith with another big man each time he touched the ball, and Kravish got some second-half relief from seldom-used backup Robert Thurman.

Kravish called playing such a huge opponent a unique experience.

"They didn't want me to wrestle with him, obviously," he said, explaining his job was to beat Smith to the spots on the floor he prefers.

Harper Kamp scored 10 points and even Thurman got into the act offensively with a career-high 11 points on 5-for-5 shooting, giving the Bears six double-figure scorers.

"When we've got guys coming off the bench, and everybody's scoring, that means everybody's making plays for each other," Kravish said.

Cal scored the first 10 points of the second half to extend a 40-39 lead to 50-39. The run reached 24-6 when Crabbe hit a 3-pointer, then a tough shot in traffic in the lane for a 64-45 advantage with 10:33 left.

"They were scoring whether we defended man or zone," UCLA coach Ben Howland said. "It was really our defense that was the problem all day. They just continued to score time after time."

The Bruins, 0-2 in conference for the first time since 1987-88, were led by Tyler Lamb with 26 points and David Wear with 17, both career highs.

THURsDAY'S GAME

Cal (12-3, 2-0 Pac-12) at Oregon St. (10-4, 0-2), 7 p.m.

INSIDE

Aaron Bright helps Stanford hold off USC. Page 3