PASADENA, Calif. — When Anthony Barr roared through the line and hit Matt Barkley squarely in the No. 7 on his back, the roar rising out of the Rose Bowl was loud enough for a whole city to hear.

After so many years underneath USC, UCLA is on top of Los Angeles and the Pac-12 South, thanks to a first-year head coach and a freshman quarterback who don't realize they've done something that's not usual.

"Well, it is for me," Jim Mora said.

Brett Hundley passed for 234 yards and a touchdown and rushed for two more scores as No. 17 UCLA beat No. 21 USC 38-28 Saturday, clinching the Pac-12 South title and emphatically snapping a five-game losing streak in their crosstown showdown.

Barkley suffered an apparent right shoulder injury in the fourth quarter. Depending upon how serious the injury is, Barkley might miss next week's season finale against Notre Dame, which might have BCS Championship Game implications for the undefeated Irish, and maybe USC's bowl game, too. With USC's season not going anywhere, there's really no need for Barkley to rush back for a bowl game and further risk his draft status.

The Los Angeles Daily News tweeted that Barkley's shoulder is separated.

Eric Kendricks blocked a punt and made a fourth-quarter interception for the Bruins (9-2, 6-2 Pac-12), who overcame intermittent second-half rain and USC's star-studded lineup with a steady effort.

"When the season started, obviously nobody thought we were going to do what we're doing now," said Hundley, who went 22 for 30 and didn't throw an interception. "But we all knew deep down inside that we could do it, that we had the talent. We can do everything we set our mind to, as long as we work hard."

Johnathan Franklin rushed for 171 yards and two touchdowns for UCLA, including a clutch 29-yard scoring run with 4:02 to play after USC pulled three points behind.

UCLA — Hundley 1 run (Fairbairn kick), 13:39.

UCLA — FG Fairbairn 23, 4:35.

UCLA — Fauria 17 pass from Hundley (Fairbairn kick), 1:34.

Second Quarter

UCLA — Franklin 16 run (Fairbairn kick), 7:38.

USC — Agholor 33 pass from Barkley (Heidari kick), 5:58.

USC — Telfer 2 pass from Barkley (Heidari kick), 1:07.

Third Quarter

USC — Uko recovered fumble in end zone (kick failed), 13:53.

UCLA — Hundley 3 run (Fairbairn kick), 9:57.

Fourth Quarter

USC — Lee 14 pass from Barkley (R.Woods pass from Barkley), 7:22.

UCLA — Franklin 29 run (Fairbairn kick), 4:02.

A — 83,277.

Rushing — USC, McNeal 21-161, Redd 3-8, Morgan 2-6, Barkley 2-3, Lee 1-(- 3), Wittek 1-(- 3). UCLA, Franklin 29-171, Thigpen 1-13, Hundley 16-10, James 3-(- 2), Team 1-(- 20).

Passing — USC, Barkley 20-38-2-301, Wittek 3-3-0-40, Team 0-2-0-0. UCLA, Hundley 22-30-0-234.

Receiving — USC, Lee 9-158, R.Woods 5-68, Agholor 3-49, Telfer 3-26, McNeal 2-25, Grimble 1-15. UCLA, Evans 8-114, Fauria 4-61, J.Johnson 4-25, Fuller 3-25, Franklin 2-14, Thigpen 1-(- 5).