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Nodouble (1965–1990) was an American Thoroughbred racehorse and sire. In a career that lasted from 1967 to 1970, he won eleven races from across the country, including the Arkansas Derby, Hawthorne Gold Cup (twice) and the Santa Anita, Brooklyn and Metropolitan Handicaps. He was twice voted American Champion Older Male Horse by the Thoroughbred Racing Association. After retirement to stud, he became the leading sire in North America of 1981 and was also a notable broodmare sire.