SAN ANTONIO >> Florida’s Walter Clayton Jr. came up with the perfect going-away present for that spirit-crushing Houston defense that bullied, battered and bedeviled him all night.

It was a defensive gem of his own. Right before the buzzer. For the win and the national title.

The Gators and Clayton somehow overcame Houston’s lockdown intensity, along with a 12-point deficit Monday night to will out a 65-63 victory in an NCAA title-game thriller decided when the Florida senior’s own D stopped the Cougars from even taking a game-winning shot at the buzzer.

Clayton finished with 11 points, all in the second half. What he’ll be remembered for most was getting Houston’s Emanuel Sharp to stop in the middle of his motion as he tried to go up for the game-winning 3 in the final seconds.

“Just go 100 percent,” Clayton said when asked what he was trying to do at the finish. “We were just trying to get a stop, and we happened to get it. I’m happy we got it done.”

With Sharp looking for room, Clayton ran at him. The Houston guard dropped the ball and, unable to pick it up lest he get called for traveling, watched it bounce.

Alex Condon dived on the ball, then flipped it to Clayton, who ran to the opposite free-throw line with the buzzer sounding and tugged his jersey out of his shorts. Next, the court was awash in Gator chomps and orange and blue confetti.“We guarded them hard and then I saw the ball loose and I just hoped we beat them to the ball,” said Florida coach Todd Golden, formerly USF’s head coach.

This marked the fourth comeback in six March Madness wins for the Gators (36-4). They led this game for a total of 64 seconds, including the last 46 ticks of a contest that was in limbo until the final shot that never came.

Houston coach Kelvin Sampson called it “incomprehensible” that the Cougars couldn’t get a shot off on either of their last two possessions.

About the last one, Sampson said: “Clayton made a great play. But that’s why you’ve got to shot fake and get into the paint. Two’s fine.”

Will Richard had 18 points to keep the Gators in it, and they won their third overall title and first since Billy Donovan went back-to-back in 2006-07.

This time, it’s Golden, in his third year, bringing the title back to Gainesville, where the Gator faithful can celebrate a win on one of college sports’ grandest stages for the first time since Tim Tebow was playing quarterback for the football team in 2008.

This was the first hoops title for the Southeastern Conference since Kentucky in 2012, and the outcome the power conference was hoping for (expecting?) after placing a record 14 teams in the tournament.

The Cougars (35-5) and Sampson were denied their first championship, and ended up in the same spot as the colorful Phi Slama Jama teams from the 1980s — oh-so-close in second place.

This was a defensive brawl — the Gators failed to crack 70 for only the second time all season — and for most of the night, Clayton got the worst of it.

He was 0 for 4 from the field without a point through the first half. Met at the top of the circle, then double-teamed and trapped when necessary, he didn’t score until hitting two free throws with 14:57 left.

The player who scored at least 30 points in the last two games, who averaged 24.6 through the first five games of the tournament, who almost singlehandedly outscored UConn and Texas Tech down the stretch of those March Madness comebacks, finished with one 3-pointer.