With a push from regular-season champion and JR Motorsports teammate Elliott Sadler, Allgaier powered his No. 7 Chevrolet to the bottom entering Turn 1 on Lap 186, passing both polesitter Erik Jones and Ryan Blaney.
But Allgaier was far from home free. A caution for Ryan Reed’s spin in Turn 2—under hard racing against Darrell “Bubba” Wallace Jr.—slowed the field for the fifth and final time and set a restart with seven laps left.
Once again, Allgaier surged into the lead, with Jones chasing. But Jones had changed lanes and moved to the outside of Sadler before he reached the start / finish line and was slapped with a pass-through penalty that ended his winning chances.
Allgaier took the checkered flag 1.772 seconds ahead of charging Kyle Larson, who fought back from a late pit road speeding penalty to finish second. Sadler came home third, followed by Daniel Henric and Austin Dillon.
“Justin had a great restart there,” said team owner Dale Earnhardt Jr., who has three cars in the Playoffs. “He found an opportunity and seized it.”
“This is incredible, man,” said Allgaier, who won for the second time this year, the second time at Chicagoland Speedway and the fifth time in his career. “I’ve been fortunate enough to go to Victory Lane here before, but on fuel mileage.“Today, my team, the 7 team, did a great job, Coming down to the end, I didn’t think we had a shot. I thought we were going to be top-five, maybe. But those late restarts—we got great restarts… We’ve got a lot of good momentum, and, man, we want to go to Homestead and pull home this championship.”