Do Deuce is a retired Japanese Thoroughbred racehorse. He was the best two-year-old colt in Japan in 2021 when he was undefeated in three races including the Ivy Stakes and the Asahi Hai Futurity Stakes. The highlight of his second campaign came when he defeated Equinox to win the Tokyo Yushun. As a four-year-old in 2023 he won the Kyoto Kinen in February and ended the year by taking the Arima Kinen. He then won the autumn edition of the Tennō Shō and the Japan Cup as a five-year-old in 2024. He was also voted Japanese Horse of the Year and JRA Award for Best Older Male Horse in the same year.