AVONDALE, Ariz. — Kyle Larson knew he wasn’t going to catch Denny Hamlin in the final laps on Sunday, not without the sort of help that only a caution flag can bring.

Larson got his lucky break.

Hamlin only got heartbreak.

Larson is now a two-time NASCAR champion after denying Hamlin what would have been his first career title when a late caution at Phoenix Raceway sent the championship-deciding finale into overtime.

Without that caution, which came with three laps to run, Hamlin had it locked up and was ready to finally shed the label of greatest NASCAR driver to never win a championship. But fellow title contender William Byron got a flat tire and hit the wall to bring out the caution, and a few minutes later, it was over.

“Just unbelievable,” Larson said. “I cannot believe it.”

Neither could Hamlin.

“I really don’t have much for emotion right now. Just numb about it ’cause just in shock,” Hamlin said after consoling his crying daughters on pit road. “We were 40 seconds away from a championship. This sport can drive you absolutely crazy because sometimes speed, talent, none of that matters.”

When the caution for Byron came out, Hamlin led the field down pit road and got four new tires on his Toyota; Larson only took two tires on his Chevrolet. It meant Larson was fifth for the two-lap sprint to the finish, with Hamlin back in 10th.

With so little time to run down Larson, Hamlin came up short with a sixth-place finish as Larson finished third. Ryan Blaney, who was eliminated from title contention last week, won the race.

“You do have to feel for that group and Denny. Doing a good job all day, it not playing out for him. But that is racing. It sucks sometimes,” Blaney said. “They can hang their head about it, but they should be very proud about the effort. They had the fastest race car here. Just one of those things where it doesn’t work out. Looked like it was going into his favor, unfortunately for him, it didn’t.”

It is the second championship for Larson, who won his first title in 2021 when he joined Hendrick Motorsports.

As Larson celebrated, Hamlin sat in his car motionless for several seconds, then wiped his face with a white towel, never showing any emotion.

Larson, who has been in a slump since his disastrous Memorial Day attempt to race both the Indianapolis 500 and Coca-Cola 600 on the same day, was also in shock.

“We didn’t lead a lap and won the championship,” Larson said. “We had an average car at best and had the right front [tire] go down, lost a lap and got the wave around, saved by the caution with the wave around. It’s just unbelievable. What a year by this motorsports team.”

When Hamlin finally got out of his car he embraced his crew members but it was a scene of disbelief among the Joe Gibbs Racing crowd. Team members were crying, some sitting in shock on the pavement; Gibbs himself stood silent, one hand on his hip and a look of disbelief on his face.

It is the sixth shot at a title to slip away from Hamlin in his 20 years driving for Gibbs. He led 208 of the 319 laps and started from the pole.

“Nothing I could do different. I mean, prepared as good as I could coming into the weekend and my team gave me a fantastic car,” Hamlin said. “Just didn’t work out. I was just praying ‘no caution’ and we had one there. What can you do? It’s just not meant to be.”

He said crew chief Chris Gayle made the correct call with four tires, but too many others took only two, which created too big of a gap for Hamlin to close on Larson in so little time.

The 44-year-old Virginia native had been extremely jinxed in five previous championship finales, with bad luck, bad strategy and bad cars breaking his heart in 2010, 2014, 2019, 2020 and 2021. Sunday was his first time eligible in the winner-take-all race in four seasons.

Hamlin was remarkably loose and calm all week, rented three houses in Scottsdale for 30 friends and family, won the pole and then dominated Sunday’s race.

He just didn’t close it out.

“Man, if you can’t win that one, I don’t know which one you can win,” Hamlin said.

Larson was OK during the race, but hasn’t won since early May, a slump that has now extended to 24 consecutive races.

Hamlin teammate Chase Briscoe finished 18th in his debut in the championship finale, while Larson teammate Byron was 33rd after his late issue. He felt awful for ruining Hamlin’s chance even though his Hendrick Motorsports teammate won the championship.

“I’m just super bummed that it was a caution obviously. I hate that. Hate it for Denny. I hate it for the 11 team,” Byron said. “I mean, Denny was on his way to it. I hate that. There’s a lot of respect there. I obviously do not want to cause a caution. If I had known what tire it was, known that a tire was going down before I got to the corner, I would have done something different.”