This game was an enormous mismatch when it was scheduled, tiny St. Katherine College in its inaugural season of basketball against San Diego State, which has played in the last four NCAA tournaments. Sophomore forward Winston Shepard scored a career-high 21 points and Dwayne Polee had 19 points and 12 rebounds as No. 20 San Diego State overwhelmed St. Katherine College 118-35 on Friday night for its ninth straight win. SDSU (10-1) finished a three-game stretch against outmanned teams. The competition gets considerably tougher when coach Steve Fisher’s Aztecs open Mountain West Conference play at Colorado State on Wednesday and then visit No. 16 Kansas on Jan. 5.