 We are the voice of NASCAR. The green flag is in the air and we are underway the great American race. The Motor Racing Network. NASCAR Cup, Xfinity, and Craftsman Truck Series Racing. Live on your hometown radio station and MRN or NASCAR.com. Martinsville. Talladega. The Chicago Street Course. We have the side-by-side action and last lap passes for the win. Photo finishes. Ryan Blaney will win. The voice of NASCAR. The Motor Racing Network.