BRISTOL, Tenn. -- Sam Mayer celebrated his recent promotion to JR Motorsports by scoring his first NASCAR national series victory with a Truck Series win Thursday night at Bristol Motor Speedway.
The 17-year-old Mayer was hired this week to race in the Xfinity Series next season for JR Motorsports. His win in his seventh career Truck Series start -- fourth this year -- was an upset in the opening race of the playoffs.
Mayer passed title contender and teammate Brett Moffitt to score the victory for GMS Racing. He's the second youngest Truck Series winner behind Cole Custer, who was 16 when he won at New Hampshire in 2014.