In Belmont Park New York, 44,000 racing fans gather to make bets on a potential triple crown winner. A three-year old horse, Assault, wins the triple crown of Thoroughbred Racing. In the next newsreel, 175,000 car racing fans gather at the first post-war speedway Memorial Day auto derby in Indianapolis. Wilbur Shaw, General Jimmy Doolittle, Henry Ford, and Roscoe Turner survey the event.