Justin Allgaier won his first NASCAR Xfinity season championship Saturday night at Phoenix Raceway, making a stunning comeback after falling a lap down midway through the race. Allgaier worked his way back through the field and passed Austin Hill and Cole Custer on an overtime restart with two laps remaining. Allgaier’s No. 7 Chevrolet took four tires during his pit stop before overtime, including two new ones on his right side, before shooting past Hill and Custer on the restart.