Brett Moffitt grabbed the lead on a late-race restart to record his fifth win of the season.
He beat Noah Gragson to the line after Gragson lost ground on a late-race battle with Grant Enfinger.
Harrison Burton finished third, with Enfinger dropping to fourth and Stewart Friesen rounding out the top five.
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Moffitt’s victory locked him into the Championship 4.
He joined Martinsville winner Johnny Sauter, who finished seventh in the race.
Justin Haley was locked into the finale with last week’s win at Texas. He blew an engine with 19 laps remaining and finished 28th.
Gragson finished second to round out the Championship 4.
Enfinger’s fourth was not enough to advance him to the finale.
Matt Crafton finished 11th and was also eliminated from contention.