(AP Photo/Steve Helber)
BRISTOL, Tenn. (AP) Sam Mayer celebrated his recent promotion to JR Motorsports with a sweep at Bristol Motor Speedway. The teen sensation opened Thursday night with his first NASCAR national series victory with a Truck Series win and followed it immediately after with an ARCA Series win.
It was quite the party for the 17-year-old Mayer, who was hired this week to race in the Xfinity Series next season for JR Motorsports. He won in his seventh career Truck Series start - fourth this year - for an upset in the opening race of the playoffs.
Mayer passed title contender and teammate Brett Moffitt with 30 laps remaining 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.