DOVER, Del. — Cole Custer raced to his seventh Xfinity Series victory of the season Saturday at Dover International Speedway.

The 21-year-old Custer, who made his 100th start, proved he’s the driver to beat as NASCAR’s second-tier series gets set to move into the next round of the playoffs. John Hunter Nemechek, Brandon Jones, Ryan Sieg and Justin Haley were eliminated from championship contention.

Custer, Christopher Bell and Tyler Reddick have combined to win 19 of the 29 Xfinity Series races.

Custer, Bell and Reddick are joined in the next round by Michael Annett, Justin Allgaier, Noah Gragson, Austin Cindric, and Chase Briscoe.

Allgaier finished second at Dover, followed by Cindric, Haley and Briscoe.

The next round starts in two weeks at Kansas Speedway.