NASCAR Sprint Cup Series Preseason Thunder

NASCAR Sprint Cup Series Preseason Thunder

DAYTONA BEACH, FL – JANUARY 11: Mark Martin, driver of the #55 Toyota, and Jeff Gordon, driver of the #24 Chevrolet, lead the field during the NASCAR Sprint Cup Preseason Thunder testing at Daytona International Speedway on January 11, 2013 in Daytona Beach, Florida. (Photo by Tom Pennington/Getty Images for NASCAR)

Greg Engle