USC safeties Dion Bailey and Su'a Cravens came up with key fourth-quarter interceptions Saturday in USC's 20-17 upset victory over fifth-ranked Stanford at the sold-out Coliseum.

Bailey, a junior, picked off a pass by Cardinal quarterback Kevin Hogan with 10 minutes 39 seconds left in the fourth quarter on a third-and-goal from the 10.

Cravens, a freshman, intercepted a tipped pass with 3:02 left to give the Trojans the possession that ended in the game-winning field goal.

Bailey and Cravens each have four interceptions this season.

Bailey has 10 career interceptions.

Linebacker Anthony Sarao had a team-best 12 tackles, linebacker Hayes Pullard 11.

Leonard Williams plays

USC defensive end Leonard Williams played despite a shoulder injury that could require surgery after the season.

The 6-foot-5, 290-pound sophomore from Florida made four tackles in the first half and finished with seven.

Soma Vainuku catching on

Fullback Soma Vainuku has been a special teams standout for USC, blocking two punts, including one that was returned for a touchdown last week against California.

Vainuku stepped up in the first quarter, catching a one-yard touchdown pass from quarterback Cody Kessler to give USC a 6-0 lead.

Vainuku also had a 15-yard reception that started the Trojans' second scoring drive.

Tre Madden returns

USC tailback Tre Madden, who played sparingly at Oregon State and sat out against Cal because of a hamstring injury, entered the game in the second quarter.

The third-year sophomore gained 11 yards in six carries.

Madden, however, remains the Trojans' leading rusher with 682 yards.

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Jordan Williamson sat out because of an apparent leg injury, so former Loyola High kicker Conrad Ukropina handled kicking for Stanford.