NBC Sports
updated 7/25/2013 12:18:09 PM ET 2013-07-25T16:18:09

The Indianapolis Motor Speedway and Circuit de Spa-Francorchamps are known more for their open-wheel races than sports car ones. But it’ll be a fleet of prototype and GT cars gracing their hallowed grounds this weekend. IMS plays host to GRAND-AM’s Rolex Series and Continental Tire Sports Car Challenge on the track’s infield road course, formerly…


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