New York ? LSU reached No. 1 the hard way.

The Tigers edged past Southern California in the AP Top 25 on Sunday, even though the Trojans remained undefeated.

On a wild weekend in college football, when half the top 10 lost, USC avoided the upset bug that struck Oklahoma, Florida, Texas and Rutgers. But a sloppy 27-24 victory at Washington on Saturday night cost the Trojans the No. 1 ranking they’ve held all season.

USC is the first team to lose the No. 1 ranking after a victory since Nov. 3, 2002, when top-ranked Miami dropped after beating Rutgers 42-17 and No. 2 Oklahoma moved up after a 27-11 victory over No. 13 Colorado.

“I have no idea how the points work and how it all adds up,” USC coach Pete Carroll said Sunday night. “It has no bearing on anything for us. It didn’t before, and it doesn’t now.

“The reason it happened is the way we played, I guess.”

LSU, which recovered from its own first-half malaise to beat Tulane 34-9 on Saturday, received 33 first-place votes from the media panel and 1,593 points. USC got 32 first-place votes, 11 fewer than last week, and 1,591 points.

LSU coach Les Miles suggested the voters didn’t get up early enough to watch the first half of the Tigers’ victory against Tulane, when they led 10-9 at the break.

“They kind of slept in and got kind of caught up on the score later in the day,” he said Sunday.