Contradictory as it seems,
Dillon was sailing along in his No. 33 Chevrolet — he led 183 of the 200 laps in the Boyd Gaming 300 — until the closing stages of the race.
Ryan Blaney, whose crew had given his No. 22 Ford four fresh tires during a caution period with about 20 laps remaining, closed to Dillon's bumper with only two laps to go.
Blaney then tried to find a way around Dillon for the lead, but Dillon kept throwing blocks to secure the win at the 1.5-mile Las Vegas Motor Speedway.
At one point, Blaney nearly lost control of his car, and flirted with hitting the outside wall, as he tried to get past Dillon.
"It was a heck of a last two laps, that's for sure," said Dillon, who mainly drives in NASCAR's premier Sprint Cup Series for his grandfather's team,
"The 22 put on a heck of a charge," Dillon said. "To give one away like that, it would have been heartbreaking. In my mind, it wasn't going to happen."
Blaney said Dillon "did what he had to do and stopped my run. I couldn't get to his outside [for the pass]."
As Blaney was catching Dillon's car, Dillon, 24, said his crew didn't tell him that Blaney had been fitted with fresh tires. It was a decision Dillon supported.
The crew "made the right call by not telling me that because . . . it will get you out of your game," Dillon said.