High Quality Content by WIKIPEDIA articles! The 12 Hours of Sebring is an annual motorsport endurance race for sports cars held at Sebring International Raceway, on the site of the former Hendricks Army Airfield World War II air base in Sebring, Florida. The event is perennially the opening round of the American Le Mans Series and in the past has been a round of the now defunct World Sportscar Championship and IMSA GT Championship. In 2012, the race was the opening event of the FIA World Endurance Championship.