Man o' War
Upset (foaled 1917 in New Jersey) is notable as the only horse to have ever defeated Man o' War. Man o' War, who would go on to a career in which he won 20 of his 21 starts, faced Upset in the seventh running of the Sanford Memorial Stakes at Saratoga Race Course on August 13, 1919. Losing by a neck, Man o' War had been fractious at the starting line and got a bad start, leaving close to last. He also carried 15 pounds more than Upset.