CONCORD, N.C. -- Trevor Bayne treated his body like a race car, and wanted as much information as possible to help it run better. Which is why he returned to the Mayo Clinic again and again for tests related to the mysterious illness that kept him off the track for two months during the same season where he electrified NASCAR by winning the sport's biggest race. Bayne said he currently has no symptoms, and his advice from doctors is that he manage heat and hydration in the race car. The 22-year-old full-time NASCAR Nationwide Series participant has been cleared to continue competition by both physicians and NASCAR. More...