If there was still any doubt the days of Southern California dominating the Pac-10 are over — at least for the near future — there’s proof positive this week.USC is a 9½-point underdog at Stanford on Saturday.It’s just the third time since 2004 that USC has been an underdog, according to the odds maker RJ Bell of Pregame.com. The last time was when USC played at Oregon in 2007. The Trojans were three-point underdogs to the Ducks that day and lost 24-17 in quarterback Mark Sanchez’s third career start.