Winston Shepard scored all of his 15 points during a second-half comeback and Skylar Spencer added 15 points to help San Diego State upset No. 14 California 72-58 in the Las Vegas Invitational on Thursday night. Shepard scored nine straight points during a 14-0 run for the Aztecs (4-2) that cut Cal's lead to 45-44 early in the second half.