KANSAS CITY, Kan. (AP) — Kyle Larson came roaring around the outside of Chris Buescher on the final lap at Kansas Speedway, banging doors with him all the way to the finish line, only to be told by his team over the radio that everything he had given was not quite enough.

It wasn’t until Larson was in Turn 3 of the cool-down lap that he saw his spotter, Tyler Monn, dancing high above the track.

In the closest finish in NASCAR history, one that only became official with a grainy black-and-white photo at the line, the No. 5 car was declared the winner by a thousandth of a second — every bit as close as the Kentucky Derby a day earlier, and an even more dramatic finish than the three-at-the-line conclusion to the Cup Series race at Atlanta earlier this season.

“Had no clue if I won or not,” Larson said, “but honestly didn’t really care. I was like, ‘Man, that was frickin’ awesome.’”