Xavier Thames drained 5-of-6 from beyond the arc en route to 19 points and Deshawn Stephens contributed 12 points and six boards for the Aztecs (5-1), who extended a remarkable run of 26 straight victories over programs in the state of California.
Jordan Adams netted a team-high 23 points on 7-of-13 shooting, while Shabazz Muhammad finished with 16 points and four rebounds for the Bruins (5-3), who had won two of three coming in.
Norman Powell donated 10 points off the bench and Larry Drew II added six points and 11 assists in defeat.