CARSON, Calif. -- Robbie Keane scored his first goals since March, and the LA Galaxy made quick work of their fourth-round clash with visiting amateurs PSA Elite.

Keane netted a hat trick and assisted Gyasi Zardes' go-ahead goal as the Galaxy dominated the USASA club from nearby Irvine, the last amateur side in the competition.

UC Riverside's Michael Salazar fired PSA ahead in the 12th minute, finishing a Jose Carrera-Garcia feed, but the Galaxy answered in the 15th and 19th minutes, through Sebastian Lletget and Zardes, Keane added to the tally with strikes in the 29th, 53rd and 70th minutes, and Baggio Husidic added the sixth in the 77th.

There was some controversy to LA's first goal, with Lletget's header from a corner kick seemingly saved on the goal line by defender Trevor Haberkorn, who headed the ball off the crossbar and away from the net. Assistant referee Issam Ashkar ruled the ball had crossed the line.

The Galaxy had a 22-6 shot advantage -- 9-3 in shots on goal -- over PSA, which last year lost 5-0 at Seattle in a fourth-round clash.

-- SCOTT FRENCH