Ross Chastain survived three restarts inside the final 20 laps to score his first Xfinity Series win Saturday at Las Vegas Motor Speedway.
Chastain led 180 of 200 laps on the way to winning the DC Solar 300.
Saturday’s race marked the regular-season finale and finalized the 12-driver playoff field.
Allgaier secured the regular-season title and 15 bonus playoff points.
The top five through 25 races is Allgaier, Custer (-44 points), Bell (-48), Sadler (-69) and Hemric (-78).