The American Le Mans Series logo.
The nation's two leading sports-car racing series, Grand-Am Road Racing and the American Le Mans Series, said Wednesday they plan to merge in 2014.
"This merger will strengthen professional sports-car racing beyond what either of our organizations could have achieved separately," ALMS founder Don Panoz said in a statement.
Both series hold races -- some of them long endurance events -- that feature different classes of sports cars, led by the exotic Daytona prototype cars in Grand-Am and the LMP1 cars in the ALMS.
Grand-Am's schedule includes the Rolex 24 at Daytona, a 24-hour endurance race at Daytona International Speedway.
Some of their races are included in weekend events that include several forms of racing. ALMS, for instance, holds one of its races during the weekend of the Toyota Grand Prix of Long Beach, an IndyCar race, on the streets of Long Beach.
Grand-Am is owned by NASCAR, and NASCAR executives Jim France and Lesa France Kennedy will be among the members of a new board of directors that will operate the merged racing series.
"With NASCAR being involved, the new series will experience an increase in stability and resources," Zak Brown, chief executive of the motorsports marketing agency JMI, said in a statement.
Grand-Am and the ALMS will continue operating separate schedules next year before merging in 2014. The name of the newly combined series has yet to be determined.
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