2003 CART champion Paul Tracy has turned his attention to sports cars including the Grand-Am round at Mazda Raceway Laguna Seca Sunday. Tracy, with all his experience and success, is faced with auditioning for a full-time ride in a sports car. The audition includes success with Action Express, the team he ran with Sunday. Tracy is finding that a single-seater's career is a little easier than the multi-seat action in a sports car. Listen…