KNOXVILLE, Iowa — The feature field for tonight’s 59th annual NOS Energy Drink Knoxville Nationals at Knoxville Raceway includes the defending winner, champions and proven winners.

Twenty of the 24 spots are set, with the final four starters to be determined through tonight’s 22-lap B main.

The field includes eight World of Outlaws NOS Energy Drink Sprint Car Series regulars, two drivers who chase the Ollie’s Bargain Outlet All Star Circuit of Champions calendar, six drivers who pick and choose where and when they race, two Knoxville Raceway regulars and one Central Pennsylvania racer.

Reigning All Star champion Aaron Reutzel and WoO regular David Gravel will share the front row for the 50-lap event, $150,000-to-win main event.

Take a closer look at each Knoxville Nationals A-Main starter by clicking below.