TAMPA, Fla. — College football’s first national championship rematch was even better than the original, with an incredible twist at the end.

Deshaun Watson and Clemson dethroned the champs and became the first team to beat Nick Saban’s Alabama dynasty in a national title game, taking down the top-ranked Crimson Tide 35-31 Monday night in the College Football Playoff.

Watson found Hunter Renfrow for a 2-yard touchdown pass with a second remaining to give the Tigers their first national championship since 1981. A year after Alabama won its fourth title under Saban with a 45-40 classic in Arizona, Clemson closed the deal and denied the Tide an unprecedented fifth championship in eight seasons.

“That has to be one of the greatest games of all time,” Clemson coach Dabo Swinney said.

The lead changed hands three times in the fourth quarter, but Watson got the ball last. Likely playing in his final college game, the junior quarterback threw for 420 yards and three touchdowns. In two games against Alabama and the most ferocious defense in college football, Watson has thrown for 825 yards and accounted for eight touchdowns. He was sacked four times and took some cringe-inducing shots from All-Americans Jonathan Allen and Reuben Foster.

“You know, I never got the sense that he was rattled,” Allen said about Watson.

Swinney, the native Alabaman and former Crimson Tide walk-on receiver, has built an elite program at Clemson that was missing only one thing. Now the Tigers can check that box, too.

“Eight years ago we set out to put Clemson back on top,” said Swinney, who can turn postgame interviews into a rousing sermon. “We came up a little short last year, but today on top of the mountain, the Clemson flag is flying.”

After three quarters of vicious hits and tight defense, Tigers-Tide II ended up looking a lot like the first meeting when the teams combined for 40 points in the fourth quarter.

Clemson took its first lead when Watson found Mike Williams for a 4-yard touchdown a minute into the fourth quarter to make it 24-21.

The Tigers took a 28-24 lead with 4:38 left in the fourth quarter when Wayne Gallman surged in from a yard out.

The Tide’s offense, which had gone dormant for most of the second half, came to life with the help of a sweet call from newly promoted offensive coordinator Steve Sarkisian. Receiver ArDarius Stewart took a backward pass from Jalen Hurts and fired a strike to O.J. Howard for 24 yards.

On the next play, Hurts broke free from a collapsing pocket and weaved his way through defenders for a 30-yard touchdown run to make it 31-28 with 2:07 left.

More than enough time for Watson.

“I was calm,” Watson said. He said he thought about Vince Young’s last-second touchdown for Texas that derailed the Southern California’s championship run in the 2005 championship game at the Rose Bowl. He told his team: “Let’s go be great.”

Watson hooked up with Williams and Jordan Leggett, who made great catches for big gains to get to first-and-goal with 14 seconds left.

A pass interference on Alabama made it first-and-goal at the 2 with six seconds left. Time for one more play to avoid a game-tying kick and potential overtime. Renfrow slipped away from the defense at the goal line with the help of some traffic created by his teammates — or maybe it was an illegal pick? — and was alone for an easy toss. It was the walk-on receiver’s second TD catch of the night, adding to the two he had last season against Alabama.

When it ended, Clemson’s 315-pound defensive lineman Christian Wilkins did a cartwheel and Ben Boulware, one of the toughest linebackers in the country, was in tears.

“Don’t call it an upset,” Swinney said. “We expected to win this game.”

The Tigers had snapped Alabama’s 26-game winning streak and beaten a No. 1 team for the first time ever.

“It’s been 35 long years!” Boulware screamed. “It’s coming home baby! It’s coming home!”

Alabama was 4-0 in national championship games under Saban. It was 106-6 in games it led at half and 96-0 when entering the fourth quarter with a double-digit lead as the Tide did Monday night. Clemson overcame all those odds.

The Tide jumped out to a 14-0 lead behind two long touchdown runs by Bo Scarbrough in the first half. The 230-pound sophomore back was pretty much Alabama’s whole offense for a while, running for 93 yards on 16 carries while Hurts and the passing game struggle. Scarbrough left in the third quarter with a leg injury, but the Tide finally found some other help. Hurts hooked up with O.J. Howard, one of last year’s heroes for ‘Bama, for a 68-yard touchdown pass to make it 24-14 late in the third quarter.

“Look, there’s not one play in the game that makes a difference in a game,” Saban said. “We could have done a lot of things a lot better. But I have to say that I was proud of the way our guys competed in the game, and just sorry for all of them that we didn’t finish it better.”

Last season Alabama met its match in Clemson, but prevailed. This time, Clemson made sure the sequel had a different ending.