The victory came in the seventh career Truck start for the 17-year-old Mayer. The win also came a few days after JR Motorsports announced that Mayer would drive for the team in the second half of the 2021 Xfinity Series, once he turns 18.
“I love this place,” Mayer told FS1 after the 200-lap race. “I don’t know what to say.”
Mayer was helped by having tires that were 52 laps fresher than Moffitt’s tires.
MORE: Race results
Mayer is not competing in the playoffs and does not advance to the second round. He said he has two more Truck races left to run this season.
Mayer followed his Truck win by taking the checkered flag in the ARCA Menards Series race that followed Thursday night.
Trevor Bayne finished fifth but his Truck was disqualified after the race for failing inspection. His truck failed post-race heights. Chandler Smith finished fifth after Bayne’s disqualification.
Mayer is the second youngest winner in series history. Cole Custer is the youngest winner in series history. Custer was 16 years, 7 months, 28 days when he won in Sept. 2014 at New Hampshire Motor Speedway.
Mayer becomes the youngest Truck winner at Bristol at 17 years, 2 months, 22 days. Ryan Blaney had held that record, winning a 2015 race there at age 21 years, 4 months, 19 days.
STAGE 1 WINNER: Brett Moffitt
STAGE 2 WINNER: Tyler Ankrum
WHO HAD A GOOD RACE: Tanner Gray’s third-place finish tied his career best. He finished third at Michigan earlier this season. … Parker Kligerman’s fourth-place finish is his best of the season while running a limited schedule.
NOTABLE: Trevor Bayne said that four weeks ago he didn’t know if he would be racing again at Bristol. He crossed the finish line fifth but his truck failed inspection after the race and was disqualified.
NEXT: The second race of the opening round of the playoffs is at 9 p.m. ET Sept. 25 at Las Vegas Motor Speedway.