USC edged Stanford in the Pac-12 football championship game in Santa Clara, Calif., on Friday night. The Trojans are the first team from the Pac-12 South to win the conference title.

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SANTA CLARA, Calif. – Sam Darnold threw for 325 yards and two touchdowns and engineered a backbreaking 99-yard drive following a goal-line stand in the fourth quarter to lead No. 11 USC to a 31-28 victory over No. 14 Stanford in the Pac-12 championship game Friday night.

“It was time to dig deep and win a championship,” Trojans coach Clay Helton said. “When you’re trying to win one, those are the plays that are going to define you and define your football team.”

Darnold threw touchdown passes to Michael Pittman Jr. and Tyler Vaughns to stake the Trojans (11-2) to the lead.

Darnold then delivered one of the biggest plays of the game when he stepped up to avoid pressure in the end zone before connecting on a 54-yard pass to Pittman to spark the key touchdown drive in the fourth.

Ronald Jones II finished that drive with an 8-yard run that made the score 31-21 to cap a productive night where he ran for 140 yards and two touchdowns to give USC its first Pac-12 title since 2008.

The long drive came after USC stuffed Stanford (9-4) at the goal line to preserve the lead before an announced crowd of 48,031 at Levi’s Stadium, home of the NFL San Francisco 49ers.

With Bryce Love nursing an injured ankle on the sideline, Cameron Scarlett was stopped on successive runs from inside the 2, including a fourth-down try from the 1 that was stopped by USC linebacker Uchenna Nwosu.

“We told our guys to hunker down and this is what Trojan football is,” Nwosu said.

Stanford coach David Shaw had no regrets about his decision, even though the Cardinal was unable to get the touchdown on offense or the stop on defense to make it pay off.

“The bottom line is, we had opportunities and we didn’t make enough plays,” Shaw said. “We made enough plays to keep it close, but not enough plays to win. The sequence of fourth-and-one to take the lead in the Pac-12 championship game, there’s no hesitation at all. That’s what we’re going to do.”

Darnold sealed the game with a 15-yard pass to Josh Falo on fourth-and-two to let USC run out the clock. The victory gives USC a season sweep against Stanford and might send the Trojans to the Dec. 30 Fiesta Bowl.

A South Division team won the Pac-12 title game for the first time since the divisions were created before the 2011 season.

Love ran for 125 yards and had his FBS-record 12th run of at least 50 yards that set up K.J. Costello’s 11-yard TD pass to Kaden Smith that cut USC’s lead to 24-21 late in the third quarter. Costello added a 28-yard TD pass to Smith with 2:09 remaining, but wasn’t nearly consistent enough to keep pace with Darnold. Costello finished 10 of 22 for 192 yards.