The Panoz LMP-1 Roadster-S would make its debut at the second race of the inaugural American Le Mans Series season in 1999. Backed by title sponsor Visteon, only one car was available in time, leading Panoz to use an older Esperante GTR-1 modified for the LMP class. However, the LMP-1 Roadster-S would perform well on its debut, taking fifth place a mere lap behind the race winner. The second chassis was completed after this race in time for the team to compete in the 24 Hours of Le Mans. Both cars finished in their endurance debut, taking seventh and eleventh places behind BMW, Audi, and Toyota.