BERKELEY -- Stephen Carr ran for a fourth-quarter touchdown two plays after Southern California's defense forced one of its six turnovers and the fifth-ranked Trojans won their 13th straight game, 30-20 over California on Saturday.
USC (4-0, 2-0 Pac-12) has dominated the series with its in-state rival by winning 14 straight against the Golden Bears (3-1, 0-1), but this was one of the tightest matchups in years as the game was tied early in the fourth quarter.
Sam Darnold threw for 223 yards and two touchdowns for the Trojans but also had an interception and was under pressure for much of the day.
It was the defense that stepped up for USC, intercepting a pass from Ross Bowers in the first quarter to set up a field goal and then delivering the big play early in the fourth quarter after Chase McGrath gave the Trojans a 16-13 lead with his third field goal of the game.
Josh Fatu knocked the ball out of Bowers' hand and Uchenna Nwosu recovered the fumble at the 3. Carr ran it in two plays later from the 2 to make it 23-13.
Ykili Ross then intercepted Bowers' pass on the next possession, setting up Darnold's 4-yard TD pass to Deontay Burnett that put away the game.
Bowers finished 22 for 50 for 303 yards with one touchdown, four interceptions and two lost fumbles.
SOUTHERN CALIFORNIA: The Trojans struggled for much of the game without starting RB Ronald Jones (ankle) and WR Steven Mitchell (groin) but managed to pull away late in their first road game of the season.
CALIFORNIA: The Bears used an improved defense to start 3-0 under first-year coach Justin Wilcox but this was supposed to be the test of how far they had come. Cal showed plenty by sticking with a national title contender for three quarters. A sequence on the opening drive of the second will haunt the Bears. Patrick Laird dropped a potential TD in the end zone and Matt Anderson then missed a 29-yard field goal that kept the game tied at 13.
A win against an unranked team should do little to alter USC's poll position.
SOUTHERN CALIFORNIA: Visits No. 18 Washington State on Friday.
CALIFORNIA: Visits No. 24 Oregon on Saturday.