Seattle Slew

Seattle Slew (February 15, 1974 – May 7, 2002) was an American Thoroughbred race horse who won the Triple Crown in 1977—the tenth of twelve horses to accomplish the feat. He is the only horse to have won the Triple Crown while having been undefeated in any race previous. In the Blood-Horse magazine List of the Top 100 U.S. Racehorses of the 20th Century Seattle Slew was ranked ninth.