USC quarterback Matt Barkley directed the Trojans' marching band with a can't-stop-smiling grin while fans chanted "One more year."

Then he ran across the field and took a giant leap into the stands, where he was hugged and slapped and cheered and idolized after throwing six touchdown passes against UCLA.

Barkley then ran into the Coliseum tunnel, perhaps for the final time in his No. 7 jersey.

If Barkley skips his senior season and enters the NFL draft, then he made his final game a doozy. Barkley completed 35 of 42 passes for 423 yards and those six scores on Saturday to lead USC to a 50-0 rout over UCLA in one of the biggest blowouts in the series in front of a sellout crowd of 93,607.

It was the the worst loss in the rivalry for UCLA since 1930, when USC beat UCLA 52-0.

"Unless he wants to do something very special as a Trojan, he ain't coming back," USC coach Lane Kiffin said.