Tracy Ann Austin Holt (born December 12, 1962, in Palos Verdes, California) is a former World No. 1 female professional tennis player from the United States who won the women's singles title at the US Open in 1979 and 1981 and the mixed doubles title at Wimbledon in 1980, before a series of injuries cut her career short.
Austin defeated 35-year-old Billie Jean King in the quarterfinals of Wimbledon in 1979 6–4, 6–7, 6–2 before losing to Martina Navrátilová in straight sets in the semifinals. Austin then became the youngest ever US Open champion, aged 16 years and 9 months. In the final, she faced Chris Evert who was bidding to win the title for the fifth consecutive year: Austin won the match 6–4, 6–3. Earlier that year, Austin had ended Evert's 125-match winning streak on clay by beating her in three sets in a semifinal of the Italian Open.
Austin lost in the semifinals of both Grand Slam tournaments she played in 1980. Evonne Goolagong Cawley, seeded fourth and the eventual champion, defeated Austin 6–3, 0–6, 6–4 at Wimbledon. As the top seed and defending champion at the US Open, Austin was expected to extend her five-match winning streak against third-ranked Evert. Austin raced to a 4–0 lead in the first set before Evert won 16 of the final 20 games to take the match 4–6, 6–1, 6–1. Evert went on to beat Hana Mandlíková in the final, thus securing for herself the year-ending World No. 1 ranking. Austin was ranked the World No. 1 singles player at times during 1980/81, partly because she captured the two sponsors' tour-ending events, defeating Navrátilová to win the Avon Championships in March and Andrea Jaeger to capture the Colgate Series Championships in January 1981. In 1980, Austin won the Wimbledon mixed doubles title with her brother John.