Seattle Slew
Seattle Slew (February 15, 1974 – May 7, 2002) was a champion American Thoroughbred racehorse who became the tenth winner of the American Triple Crown (1977). He is one of only two horses to have won the Triple Crown while been undefeated in any previous race; the second was Justify who won the Triple Crown in 2018 and is descended from Seattle Slew. Seattle Slew was the 1977 Horse of the Year and a champion at ages two, three, and four. In the "Blood-Horse" magazine List of the Top 100 U.S. Racehorses of the 20th Century Seattle Slew was ranked ninth.