With his first victory in a playoff elimination race and his third at Martinsville Speedway, William Byron outdueled Ryan Blaney to earn a spot in the Championship 4.
Byron led three times for a career-best 304 of 500 laps, including the final 44, for his 16th career victory in the Cup Series. He has led a series-best 1,278 laps this year.
Blaney, who led a series-best 177 laps, finished second, followed by Chase Elliott, Ross Chastain and Kyle Larson, who locked up the final title-eligible spot in the Nov. 2 season finale at Phoenix Raceway.
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The championship will be a battle between Joe Gibbs Racing (with Denny Hamlin and Chase Briscoe) vs. Hendrick Motorsports (Byron and Larson).
With his third victory this season, Byron ended an 11-race winless streak dating to August at Iowa Speedway.