AP Top 25 Takeaways: No. 1 Clemson ... but for how long?

Clemson might relinquish the No. 1 ranking on Sunday when the new AP Top 25 is released, and Trevor Lawrence is probably already out of the Heisman Trophy race.

None of this is a particularly big deal. In fact, it all feels familiar for the Tigers, who held off a late 2-point conversion to win at North Carolina on Saturday in a game where the Tar Heels were about a four-touchdown underdog.

Quibble with coach Mack Brown's decision to go for 2 with 1:17 left if you want. It was the right call. It's never a good idea for a big underdog to play for overtime.

But the story was the defending national champions looking far less than the juggernaut they were expected to be when they were voted preseason No. 1 in the AP poll for the first time in the history of the program.

"I know we're supposed to just destroy everybody," coach Dabo Swinney told reporters after the game, dismissing that as unrealistic.

Sorry, Dabo, but it's impossible to ignore the disparity between Clemson and the rest of the Atlantic Coast Conference, and not expect the Tigers to have their way every week.

This was the first time Clemson has been remotely challenged, though they haven't been as spectacular as, say, Alabama has with Tua Tagovailoa and his loaded group of receivers.

The crux of the Tigers' problems — if you want to call them that — is Lawrence.

Call it a sophomore slump. Maybe he's pressing. Lawrence came into Saturday ranked 55th in FBS in passer rating (147.92), completing 62% of his passes with seven touchdowns and five interceptions.

Against North Carolina, Lawrence was a modest 18 for 30 for 206 yards with a touchdown pass that turned out to the game-winner. But he also missed some throws that could have broken the game open and didn't make some smaller player that keep drives going.

Clemson has been here before.

Almost exactly a year ago, Clemson needed a late rally to beat Syracuse in Death Valley. That was the last close game the Tigers played all season. But that game came at the end of a weird week in which Lawrence replaced Kelly Bryant as starter. Then Lawrence was injured against the Orange. This feels more like Clemson's first championship season in 2016, when Deshaun Watson and Mike Williams were supposed to be unstoppable but took a while to get revved up.

The slow start for Lawrence has put him so far behind Tagovailoa, Oklahoma's Jalen Hurts, LSU's Joe Burrow and Ohio State's Justin Fields in the Heisman race there is likely no coming back. Not when Clemson will be playing North Carolina State, Wake Forest and South Carolina in November.