A normally boisterous matchup of West Coast rivals was more muted Monday — and much less blue — as the teams met for their first game in San Francisco since the vicious beating of a fan in Los Angeles.Steven Perez, 16 and smiling, was every inch the Dodger fan. Dodger gear. Dodger blue threaded through the bands of his braces. The Oakdale High School student didn't think twice about sporting his team's colors. He was, after all, at AT&T Park, home of the San Francisco Giants.