Mayer is the 2019 and 2020 East Series champion. He drove for GMS Racing (the other Drivers Edge Development team) both of those years in their No. 21 car and also won the inaugural championship of the ARCA Menards Series Sioux Chief Showdown in 2020. 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.
Mayer got off to an early start in racing, competing in go-kart events at the age of four. Although his father, Scott Mayer, was an open-wheel racer, Sam chose in his preteen years to focus on stock car racing. Over the course of the 2017 summer, during which Mayer turned fourteen, he spent the summer in Charlotte to race Legends cars; he won the Young Lions division of the Charlotte Motor Speedway Summer Shootout. He also raced in a Limited Late Model and won at Greenville-Pickens Speedway to become the track's youngest winner. He came back to Wisconsin and won a September Midwest Truck Series race at Dells Raceway Park in his first series start.
In 2017, Mayer came in touch with industry veteran Lorin Ranier, who eventually landed Mayer a late model ride with JR Motorsports in the CARS Tour for 2018. Mayer's late model racing also brought him to the World Series of Asphalt, where he finished second to Stephen Nasse. Ranier also led Mayer to MDM Motorsports for a limited slate in the ARCA Racing Series and NASCAR K&N Pro Series East in the back half of 2018, with age restrictions being a factor in which races Mayer could run, as both series only let 15-year-old competitors race on certain tracks. In his first ARCA race, Mayer ran as high as third and finished inside the top-ten. After the CARS Tour season was over, Mayer was voted the series' Most Popular Driver for 2018. The CARS Tour season included one victory, at Wake County Speedway.

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