With a 20th-place finish, Dillon -- the No. 32 and final seed in the In-Season Challenge -- advanced to the final round of the tournament, where he will race Gibbs (who won his matchup against Tyler Reddick) for a $1 million prize in next weekend's Brickyard 400 at Indianapolis.

Dillon had luck on his side during his run, with his lone top-10 finish coming in the first race in Atlanta. He advanced in that race after Hamlin crashed out and finished 31st. Dillon twice has finished 20th, including at Dover. He has a best finish of 13th in five career races on the Indy oval.

Denny Hamlin held off all challengers, including the rain, to win the AutoTrader EchoPark Automotive 400 in overtime