A racer in his own right, Mark had done several years of racing go karts with numerous wins under his belt. Mark showed the talent that was needed to maintain the Spec Racers to the highest of standards. In 1994, Mark purchased a used Spec Racer and immediately won his first race. Mark continued with his racing effort moving to the national race series where he was a multiple race winner in the Spec Racer earning an invitation to the SCCA National Championships in 1997 and 2006.

His racing took him to a sponsored ride in the Grand Am in a Marcos GT for a 2 race stint. His talent was then used by a team that raced in the Grand Am Cup series for a full year with several top 10 qualifying runs with top 10 finishes. Mark's focus was returned to RMS where Mick sponsored him under the RMS banner in the new Formula Enterprises Van Diemen that the SCCA was now marketing thru the Customer Service network. Eaton immediately again was on the podium with several wins in his first year in the car. In 2007, with 3 wins in 3 races, Mark was entered in the ARRC race to determine the FE national champion. In a 40 car field, Mark won the race, with 2 other RMS customers finishing second and third. A sweep of the podium by RMS prepared cars! Mark continued his chase for a perfect season in the RMS sponsored FE in 2008. He set 2 track records and won 7 of 8 races, with his only non-winning race a DFN after an accident. In 2008 he had a dream national race season winning the S.E. Division points, the June sprints and followed that up with a win at the National Championship Runoffs in Topeka for the rare Triple Crown of SCCA racing. Mark became the RMS team manager and has provided an outstanding reputation for RMS in car reliability, safety, and speed.