There have been many great race horses, but only a single one that bordered on supernatural: Secretariat. V 17 Comments 2 American Pharoah American Pharoah is an American Thoroughbred racehorse who won the American Triple Crown and the Breeders' Cup Classic in 2015. In winning all four races, he became the first horse to win the Grand Slam of American horse racing. 6th best time in Belmont, and 1st horse to win Grand Slam.