Austin Dillon, who will start Sunday's Auto Club 400 from the pole, won Saturday's XFinity Series TreatMyClot.com 300 by Janssen at Fontana.
Dillon went outside on the final turn and scooted past Kyle Busch just as Busch's No. 18 car blew a tire.
MORE: 10 things to know about the Auto Club 400
.@austindillon3 SQUEAKS by a damaged @KyleBusch car on the last turn to win!#TreatMyClot300 pic.twitter.com/rCaqHQQE1F
— NASCAR XFINITY (@NASCAR_XFINITY) March 19, 2016
Dillon claimed the checkered flag seconds later.