Mexico's Luis Diaz completes 8Star Motorsports' lineup for the remaining sprint races in the 2014 TUDOR United SportsCar Championship, beginning with the Continental Tire Monterey Grand Prix Powered by Mazda at Mazda Raceway Laguna Seca (May 3-4). Diaz joins Enzo Potolicchio's 8Star Motorsports team alongside American Sean Rayhall.Diaz had a...