Drivers and teams in North America are again under one sanctioning organization, the International Motor Sports Association (IMSA), opened the racing season with an endurance test at Daytona International Speedway, the Rolex 24 At Daytona. The merger of the American Le Mans Series presented by Tequila Patron and the GRAND-AM Rolex Sports Car Series, achieved after more than a decade of separate operations, created the new TUDOR United SportsCar Championship. The race got off to a cool start as teams and drivers faced cooler than normal temperatures at Daytona. Teams were dealing with high winds coming off the high-banks. Action Express Racing led a Corvette podium sweep in the 24-hour race, where Joao Barbosa held off Max Angelelli to preserve a second overall win in four years Sunday.