Larson emerged late in the race with the lead following the final round of green-flag pit stops, but a caution for a spin by series returnee Ryan Newman left Larson and Chastain to battle side-by-side on the restart with 13 laps to go.
Hendrick Chevrolet driver Larson nudged Trackhouse counterpart Chastain up into the wall as behind Joey Logano hit Martin Truex Jr., which ended the stage one winner's day and put the race back under caution.
