Samuel Adam Mayer (born June 26, 2003) is an American professional stock car racing driver.

Mayer started his NASCAR career driving for Jefferson Pitts Racing and MDM Motorsports in 2018 before joining GMS, JRM, and Chevrolet as a development driver in 2019.

[3] Although his father, Scott Mayer, was an open-wheel racer, Sam chose in his preteen years to focus on stock car racing.

Mayer's late model racing also brought him to the World Series of Asphalt, where he finished second to Stephen Nasse.

All four of the Truck races will come after Mayer turns sixteen; his debut is slated to be at Bristol Motor Speedway in August.

[9] He nearly scored his first ARCA Menards Series win at Gateway in June after a late pit gamble, but was moved up the track by Ty Gibbs in the final set of corners and was relegated to third.

[12] The injury forced Colin Braun to sub in for Mayer midway through the AMS race at the Daytona International Speedway road course.

[14] On September 15, 2020, Mayer and JR Motorsports announced an agreement to have him drive one of the organization's NASCAR Xfinity Series cars part-time in the latter portion of 2021 and full-time in the 2022 season.

[17] Mayer won the East finale at Five Flags Speedway to capture the series championship with an average finish of 1.2 on the season.

[18] On January 14, 2021, defending ARCA champion Bret Holmes announced he would begin fielding a part-time Truck Series team, the No.

At the Martinsville spring race on April 8, Mayer finished fifth after doing a bump and run on Ty Gibbs on the final lap.

After the race, Gibbs attempted to spin Mayer out during the cool-down laps before both drivers engaged in a fistfight on pit road.

* Season still in progress 1 Ineligible for series points (key) (Bold – Pole position awarded by qualifying time.