Miami ? Matt Leinart and his Southern California teammates played to perfection, leaving nothing to argue about this national championship.

Even better, they don’t have to share it.

The Heisman Trophy winner threw a record five touchdown passes, and USC overwhelmed Oklahoma, 55-19, Tuesday night in the Orange Bowl, assuring the Trojans will end the season just as they started: No. 1.

“I think we proved tonight that we are the number-one team in the country without a doubt,” Leinart said. “No doubt.”

The much-anticipated battle of unbeatens, No. 1 vs. No. 2, turned into a coronation for USC, which had to settle for a share of the national championship last year after being left out of the Bowl Championship Series title game.

That was no consolation for unbeaten Auburn, the odd team out of the BCS title game this season.

The Tigers (13-0) stated their case with a 16-13 victory over Virginia Tech in the Sugar Bowl on Monday night and could have done no worse than Oklahoma against Southern Cal. But they can only hope for second when the final Associated Press poll is released early this morning.

“We didn’t expect it to be this easy, but the game went our way from the beginning,” USC coach Pete Carroll said. “I was a little surprised.”

USC surely will become the first team to repeat as AP national champions since Nebraska in 1994-95 and join Florida State in 1999 as the only teams to go wire-to-wire — from preseason to post-bowls — as No. 1.

Southern California coach Pete Carroll, left, hugs quarterback Matt Leinart after the Orange Bowl. The Trojans beat Oklahoma, 55-19, Tuesday in Miami to win the national championship behind five touchdown passes from Leinart, the 2004 Heisman Trophy winner.

USC was shut out of last season’s BCS title game despite topping both the AP Top 25 and coaches’ poll at the end of the regular season. The BCS computer rankings favored Oklahoma, even though the Sooners lost the Big 12 Conference title game, 35-7.

Oklahoma then washed out in the BCS championship game, losing to LSU in the Sugar Bowl, 21-14, to give the Tigers the top spot in the coaches’ poll.

The Trojans wrapped up their 2003 national title three days before the BCS championship game by beating Michigan 28-14 in the Rose Bowl.

They won’t have to wait for their trophy this season.

With the aide of four Oklahoma turnovers, the Trojans (13-0) ambushed the Sooners (12-1) with 38 points in the final 20 minutes of the first half.

“I think they’re great, and they sure proved it,” Oklahoma coach Bob Stoops said. “We just got whupped.”

The first meeting of Heisman winners couldn’t have been more one-sided. Leinart set an Orange Bowl record with his five scoring tosses, and Jason White spent another BCS title game running for his life.

Oklahoma’s Heisman winner finished 24-of-36 for 244 yards with three interceptions and two touchdowns.

Oklahoma coach Bob Stoops looks at the scoreboard during the final seconds of the first half.

Leinart was 18-of-35 for 342 yards and he had the USC band playing “Fight On” all night. The laid-back Californian who replaced Carson Palmer became the first Heisman winner to win a national title since Michigan’s Charles Woodson in 1997.

Leinart looked nothing like the overrated quarterback for an average offense as Oklahoma defensive end Larry Birdine described him.

He tossed four scores in the first half as the Trojans turned an early 7-0 deficit into a 38-10 halftime lead.

And when the demolition had ended, the Trojans bounced and danced their way to the locker room, grooving in the end zone as Outkast’s “Hey Ya” blared through Pro Player Stadium. Meanwhile, the Sooners trudged off having already allowed more points in a bowl game than any team in school history.

Leinart shrugged off Birdine’s comment and played great in what could be his farewell to college football. The junior could be a top pick in the next NFL draft.

He also got plenty of help. The Trojans reached a season high for points and turned the game into a USC highlight reel, with Leinart making pinpoint passes and his receivers making spectacular catches.

Steve Smith caught an Orange Bowl record three touchdowns, LenDale White ran for 118 yards and two scores, and the USC’s defense smothered Oklahoma’s freshman sensation Adrian Peterson.

Peterson, the Heisman runner-up, managed just 82 yards on 25 carries.

Oklahoma's Adrian Peterson (28) fumbles the ball under pressure from Southern Cal's Lofa Tatupu (58) during the third quarter. USC beat Oklahoma, 55-19, Tuesday in Miami.

Senior Mark Bradley made a freshman mistake that set off one of those USC runs that have done in so many opponents during the Trojans’ 22-game winning streak.

The Sooners’ most versatile player and the son of former Oklahoma quarterback Danny Bradley tried to scoop up a punt that had bounced inside the Oklahoma 5. Collin Ashton grabbed on to Bradley, the ball squirted away and USC recovered at the 6.

Bradley trudged back to the sideline, where he received pats on the head and back.

His mood no doubt worsened on the next play, when LenDale White reached the ball over the goal line to give the Trojans a 14-7 lead late in the first quarter.

USC made it 21 straight points with the help of Oklahoma’s second turnover. Under pressure, White heaved a deep ball into quadruple-coverage and Jason Leach came up with USC’s 20th interception of the season.

Then the Trojans went to work on Oklahoma freshman cornerback Marcus Walker with their own star freshman, Dwayne Jarrett.

The 6-foot-5 Jarrett went over the 5-11 Walker for an 18 yard gain on third-and-8.

Walker ended up in no-man’s land on the next play. He looked like he wanted to blitz but stopped. Meanwhile, Jarrett ran straight down the sideline and hauled in a perfect throw from Leinart for a 54-yard score.

And it would only get worse from there for the Sooners.