One And Only (Japanese: ワンアンドオンリー, foaled 23 February 2011) is a Japanese Thoroughbred racehorse and sire best known for his win in the 2014 Tokyo Yushun (Japanese Derby). He showed great promise as a juvenile in 2013 when he won two of his six races including the Grade 3 Radio Nikkei Hai Nisai Stakes. In the following year he ran second in the Yayoi Sho and fourth in the Satsuki Sho before taking the Tokyo Yushun and added another major success in autumn when he won the Kobe Shimbun Hai. He finished third in the Dubai Sheema Classic on his first appearance as a four-year-old but was disappointing thereafter as he failed to win or place in nineteen subsequent races.