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1977: SEATTLE SLEW - Jockey Angel Cordero urges Seattle Slew (5) down the final stretch at New York's Belmont Park. ( Seattle Slew At Belmont )

1973: SECRETARIAT - Jockey Ron Turcotte begins to stand up as he rides Secretariat across the finish line during the 99th Kentucky Derby at Churchill Downs in Louisville, Ky. on May 5, 1973. Secretariat won the Triple Crown that year. ( SECRETARIAT KENTUCKY DERBY )

1948: CITATION - Citation, ridden by Eddie Arcaro, races home an easy winner in the $100,000 added Belmont Stakes Race and the Triple Crown at Belmont Park in Elmont, N.Y., in 1948 photo. (AP Photo) ( BELMONT CENTENNIAL )

1946: ASSAULT - Assault, far left, thunders down to the finish line to win the 72nd Kentucky Derby at Churchill Downs in Louisville, Ky., on May 4, 1946. Spy Song, with the white-marked forehead, finished second and Hampden, left from Spy Song, was third. Assault went on to win the Triple Crown. (AP Photo) ( KENTUCKY DERBY 1946 )

1943: COUNT FLEET - Jockey Johnny Longden is seated on Count Fleet in New York in 1943. Longden rode Count Fleet to thoroughbred racing's Triple Crown, with victories in the Kentucky Derby, Preakness and Belmont Stakes. (AP Photo) ( COUNT FLEET JOCKEY LONGDEN )

1941: WHIRLAWAY - Whirlaway is draped with the floral tribute in the winner's circle at Belmont Park, N.Y., on June 7, 1941 after winning the Belmont Stakes race of the Triple Crown with jockey Eddie Arcaro. (AP Photo) ( WHIRLAWAY TRIPLE CROWN )

1937: WAR ADMIRAL - War Admiral wins the Kentucky Derby two lengths ahead of his challenger, Pompoon, at Churchill Downs in Louisville, Ky. in 1937. The speedy son of Man o' War won after asserting his superiority early in the race. (AP Photo) ( WAR ADMIRAL WINS KENTUCKY DERBY )

1935: OMAHA - Jockey Willie Saunders sits atop Omaha, after after winning the Preakness Stakes at Pimlico Race Course in Baltimore, Md., in 1935. (AP Photo) ( PREAKNESS OMAHA JOCKEY SAUNDERS )

1930: GALLANT FOX - Gallant Fox, with jockey Earl Sande up, wears the roses after winning the 1930 Kentucky Derby. Gallant Fox went on to win the Triple Crown. (AP Photo) ( GALLANT FOX KENTUCKY DERBY )

1919: SIR BARTON - Winner of the 44the Kentucky Derby, Sir Barton went on to become the first winner of the Triple Crown in 1919. (AP Photo) ( SIR BARTON 1919 DERBY WINNER )