Sir Barton was the first Triple Crown winner in 1919, capturing the Kentucky Derby, the Preakness and the Belmont Stakes. (AP Photo) (AP Photo/ Anonymous)
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) (AP Photo/ XSS HMB)
Omaha was the Triple Crown winner in 1935, capturing the Kentucky Derby, Preakness, and Belmont Stakes. (AP Photo) (AP Photo/ V PO PEC XPEC)
War Admiral approaches the finish line to win the $50,000 Widener Cup at Hialeah racetrack in 1938. War Admiral was the 1937 Triple Crown winner. (AP Photo) (AP Photo/ XNBG DD**NY**)
Whirlaway is draped with the floral tribute in the winner's circle on June 7, 1941 after winning the Belmont Stakes race with jockey Eddie Arcaro. (AP Photo) (AP Photo/ XSS SAV)
Jockey Johnny Longden is seated on Count Fleet in New York on May 22, 1943. Longden rode Count Fleet to thoroughbred racing's Triple Crown. (AP Photo) (AP Photo/ MEE DB RWP JMB PF PC)
Assault, far left, thunders down to the finish line to win the 72nd Kentucky Derby at Churchill Downs on May 4, 1946. Assault went on to win the Preakness and Belmont. (AP Photo) (AP Photo/ XNBG AD)
Ron Turcotte, aboard Secretariat, looks at the field as they make the final turn on the way to winning the Belmont by 31 lengths, and the 1973 Triple Crown. (AP Photo/Dave Pickoff) (AP Photo/ DAVE PICKOFF)
Jean Cruguet is up in the saddle as he rides Seattle Slew to the finish at the Belmont, June 11, 1977, after winning the Kentucky Derby and Preakness. (AP Photo/Richard Drew) (AP Photo/ Richard Drew)
With Steve Cauthen in the saddle, Affirmed captures the Belmont Stakes with a narrow victory over Alydar in June 1978 in Elmont, New York to gain the Triple Crown. (AP Photo) (AP Photo/ ID DP, CB. KEY V, RE. XCJ)