LOS ANGELES -- Malcolm Smith returned one of Southern California's three interceptions 62 yards for an early touchdown, and the Trojans (No. 20 ESPN/USA Today, No. 24 AP) regained their defensive pride while maintaining their city dominance with a 28-7 victory over UCLA on Saturday night. Matt Barkley's 48-yard touchdown pass to Damian Williams with 44 seconds left led to an ebullient USC celebration that nearly set off an all-out fight between the teams in their 79th crosstown showdown.