California 60, No. 1 Arizona 58: Justin Cobbs sank a jumper with nine-tenths of a second left and the Golden Bears stunned the visiting Wildcats, ending their program-record 21-game winning streak to start the season.Cobbs scored 16 of his 19 points in the second half while also contributing seven assists for California (15-7, 6-3 Pac-12). David Kravish added 14 points, 11 rebounds and four blocked shots, Richard Solomon had 12 points and seven rebounds and Tyrone Wallace scored 11 for the Golden Bears.Kaleb Tarczewski scored a career-high 18 points and went 12-for-12 from the free-throw line, but it wasn't enough for Arizona (8-1 Pac-12), which lost starting forward Brandon Ashley to a foot injury early in the contest. T.J. McConnell contributed 13 points but the team's assist leader went without an assist and freshman Rondae Hollis-Jefferson scored 10 points off the bench in place of Ashley.California took its biggest lead of the second half at 50-42 with 11 minutes left but Arizona began chipping away and took its first lead at 56-54 on a jumper by Tarczewski with 4:18 to play. Cobbs ended a five-minute scoreless spell with a jumper and tied the score one more time with two free throws before sinking the winner.Ashley, who came in tied with Aaron Gordon as the team's second-leading scorer, headed to the locker room with just under 18 minutes left in the first half and it was quickly announced he would not return due to a right foot injury. California did not trail in the first half, leading by as many as nine with just over five minutes left before taking a 30-29 lead into the break after the Wildcats closed on a 6-0 run.GAME NOTEBOOK: Gordon finished with eight points, matched his season high with 13 rebounds and contributed six assists. … Arizona leading scorer Nick Johnson (16.7) finished with a season-low four points on 1-for-14 shooting and five turnovers. … Arizona trailed at the half for the seventh time this season.