The Elk Grove, California, native drew himself into a tie with Denny Hamlin for the lead in the regular-season standings after capturing his fifth Cup victory of the season at The Glen.
The Tampa, Florida, native erased his difficult regular-season stretch by guaranteeing himself a 2021 Cup Playoff berth following a late victory in the Magic Mile.
Elliott started 34th after failing to post a qualifying time, but methodically worked his way into the lead, passing Matt DiBenedetto on Lap 38, and then overtaking Kyle Busch with 17 to go.