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Mathieu stripped fill-in punt returner Kenjon Barner, scooped up the ball after it bounced at the 3 and scored for the Tigers early in the second quarter.

Montgomery caused the first of consecutive fumbles by highly touted Oregon freshman De’Anthony Thomas. Those turnovers led to a pair of TD runs by LSU in less than 3 1/2 minutes for a 30-13 lead late in the third quarter.

“I think we took the heart out of those guys,” Mathieu said. “I don’t think they were fighting for anything after that.”

James had one of his worst games at Oregon, with 18 carries for 54 yards, though that was enough to surpass Derek Loville as the school’s career rushing leader with 3,331 yards. Darron Thomas was 31-of-54 passing for 240 yards with a touchdown and an interception.

The Ducks got 70 of their 335 total yards on a drive that ended with DeAnthony Thomas’ 4-yard TD run in the final minute.

If the Ducks are even going to stay in the national championship conversation this season, they have to recover in a hurry. They have consecutive losses for the first time since losing their last three regular-season games in 2007.

Oregon is home Saturday in the season opener for Nevada, which last Thanksgiving weekend beat Boise State to keep the Broncos from being a BCS buster again.

“As I told them in the locker room, you guys better get ready for Round 2 because Round 2 is 13-1 last year with a six-point loss at Hawaii and a coach (Chris Ault) who is in the Hall of Fame,” Kelly said. “We better get ready to play.”

Fifth-ranked Boise State got started this season with a 35-21 victory over 19th-ranked Georgia in the Georgia Dome on Saturday night, at the same time Oregon was losing.

Next for LSU is its home opener against Northwestern State on Saturday, five days before the Tigers play their SEC opener at No. 20 Mississippi State.

“We need to be improved on offense. We don’t feel like we hung the moon in any way,” Miles said. “The defense played a spectacular game. They weren’t perfect either. But they played with an intensity and a speed to the ball. That defense was pretty special.”