HAMPTON, Ga. (AP) Kyle Busch's car failed a post-race inspection and he has been disqualified as the pole winner for Sunday's NASCAR Sprint Cup race.
The ruling leaves brother Kurt Busch as the pole winner.
Kurt Busch ran strong through all three elimination rounds on Friday and had the top speed at 191.582 mph before he was topped by Kyle's fast lap of 191.668 mph in his No. 18 Toyota.
NASCAR did not immediately announce why Kyle Busch's car failed the inspection at Atlanta Motor Speedway. He must start at the back of the field.
Jamie McMurray, who had the top speed in the second round, will start beside Kurt Busch on the front row, followed by Trevor Bayne and Ryan Newman.
Denny Hamlin, fresh off last week's Daytona 500 win, was eliminated in the second round.