The in-season challenge field is down to eight drivers as the Cup Series sees another non-oval on deck for this weekend: Sonoma Raceway.

As world-renowned as the Sonoma Valley is for its place as California's Wine Country, it also features a racetrack that is respected by the world's racers as well.

Sonoma is the site of round three of the challenge with eight drivers still in contention for the $1 million prize.