Texas A&M 29
Alabama 24

TUSCALOOSA, Ala. — Johnny Football and Southeastern Conference newbies Texas A&M took down the biggest bully in their new neighborhood and left No. 1 Alabama with badly bruised national championship hopes.

Johnny Manziel, better known around Texas as Johnny Football, staked the 15th-ranked Aggies to a three-touchdown lead in the first quarter, and Texas A&M held on to beat the Crimson Tide, 29-24, on Saturday.

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The Aggies (8-2, 5-2), playing in the SEC for the first season after ditching the Big 12, also might have ended the league’s run of BCS titles at six years.

The defending national champion Crimson Tide (9-1, 6-1), who have been No. 1 almost all season, didn’t go quietly.

AJ McCarron nearly pulled off a second straight scintillating comeback. He threw one touchdown pass and motored the ball downfield before Deshazor Everett stepped in front of his fourth-down pass at the goal line with 1:36 left.

Manziel passed for 253 yards and rushed for 92 and led the Aggies to a 20-0 first-quarter lead.

“No moment is too big for him,” coach Kevin Sumlin said of his remarkable redshirt freshman.

The Aggies had been 1-10 against top-ranked teams with the only previous win coming 30-26 over Oklahoma in 2002, but Manziel and Sumlin have entered the SEC with speed and swagger — and fit right in.

Alabama managed a second-shot national title after losing to LSU just over a year ago in the regular season but seems a long shot to do it again. Alabama would have secured a spot in the SEC championship game with a victory and only Western Carolina and Auburn remaining.

“Two of the three national championship teams that I coached lost a game,” Tide coach Nick Saban said, counting one at LSU. “This team still has an opportunity to win the West and go to the SEC championship game and win a championship. There’s still a lot for this team to play for.”

Now, the Tide will have to beat the Tigers to clinch the West and get into the SEC title game. As for the national title, Alabama will have to hope for another shakeup in the form of losses by Kansas State, Oregon, and Notre Dame. If the Tide wins out, and two of those teams go down, a third national championship in four seasons is still in play — along with a seventh straight for the SEC.

For now though, the SEC is on the outside looking in at the BCS title race.

Alabama kept coming back, but never caught up with Manziel and Texas A&M.

The nation’s top scoring defense forced a punt with less than a minute left, but A&M never had to kick it away.

The Tide was penalized for offisides, giving Texas A&M a first down and a chance to kneel out the clock.

‘‘The players were told ‘make sure you stay onsides, they are going to try to get you to jump offsides with a shift or a motion or something,’ ’’ Saban said.

McCarron breathed life into Alabama with a 54-yard touchdown pass down the left sideline to freshman Amari Cooper to make it 29-24 with 4:29 left.

A quick three-and-out by the Aggies put the ball in McCarron’s hands again. He opened at the 40 with a 54-yarder to speedster Kenny Bell down to the 6. Two scrambles and an Eddie Lacy run left one final shot from the 2 against a Texas A&M defense often overshadowed by its potent offense.

He had some time on third down, rolling left but finding Lacy well covered and having to try running it, a la Manziel, before Dustin Harris stopped him at the 2.

McCarron completed 21 of 34 passes for 309 yard but also was intercepted twice, ending his streak without getting picked off at 291 passes.

Manziel completed 24 of 31 passes with two touchdowns and ran 18 times, including four sacks.

He kept finding Ryan Swope. They hooked up 11 times for 111 yards and a 10-yard touchdown where Manziel bobbled the ball as defenders swarmed him, reversed field, and spotted Swope alone in the back of the end zone.

Manziel led three first-quarter touchdown drives for a 20-0 lead to stun the Bryant-Denny Stadium crowd of 101,821.