I'll Have Another bares his teeth after a workout at Belmont Park. The Kentucky Derby and Preakness winner tries to become the 12th horse to win horse racing's Triple Crown on Saturday. Click through the gallery to see the other 11. | AP

AFFIRMED, 1978, Steve Cauthen. Affirmed defeated rival Alydar in each of the Triple Crown races and was 7-3 lifetime against Alydar in one of racing's greatest duels.

SEATTLE SLEW, 1977, Jean Cruguet. Seattle SLew is the only horse to win the Triple Crown while undefeated. He finished his career 14-2.

SECRETARIAT, 1973, Ron Turcotte. There was a gap of 25 years of Triple Crown winners before Big Red hit the trifecta. He set records in both the Kentucky Derby (1:59 2/5) and the Belmont Stakes (2:24), both of which stand today.

CITATION, 1948, Eddie Arcaro. The bay colt is one of only three horses to win 16 consecutive races (Cigar, Zenyatta) and was the first horse to go over $1 million in winnings.

ASSAULT, 1946, Warren Mehrtens. Maybe the least celebrated of all Triple Crown winners, Assault is the only Texas-bred horse to win it.

COUNT FLEET, 1943, Johnny Longden. Count Fleet was owned by the wife of John Hertz, the man who started Hertz car rental.

WHIRLAWAY, 1941, Eddie Arcaro. Whirlaway had problems running straight, so trainer Ben Jones cut a small hole in the horse's blinker during training forthe Kentucky Derby, and Whirlaway found the finish line first.

WAR ADMIRAL, 1937, Charley Kurtsinger. He'll forever be linked to Seabiscuit, but War Admiral won the Triple Crown and Horse of the Year. Seabiscuit defeated the Admiral a year later at Pimlico in a match race and later became a movie star.

OMAHA, 1935, Willie Saunders. An unlikely winner of the Crown, Omaha had won just one of nine races leading up to the Kentucky Derby.

GALLANT FOX, 1930, Earl Sande. After winning horse racing's three biggest races, the New York Times termed it the "Triple Crown" in describing the efforts of Gallant Fox.

SIR BARTON, 1919, Johnny Loftus. After going 0-for-6 as a 2-year-old, Sir Barton was sold for $10,000 to Canadian owner J.K.L. Ross. He went on to earn over $116,000.