Brett Moffitt grabbed the lead on a late-race restart to record his fifth win of the season.
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.