Blaney's victory was a surprise after Busch, seeking to become the first driver ever to win four consecutive races in the series on the 0.533-mile oval, had dominated, especially on restarts.
Battling at various times against the youngest and brightest stars in the series, Busch generally made quick work of them. He led 161 of the 300 laps and seemed poised for his record 67th victory in the series.
But on the final restart, Blaney darted to the lead from the inside, and Busch never quite caught up.