Tracy Ann Austin Holt is an American former professional tennis player. She was ranked the world No. 1 in women's singles by the Women's Tennis Association (WTA) for 21 weeks. Austin won 30 WTA Tour-level singles titles, including two major titles at the 1979 and 1981 US Opens, and five doubles titles, including the mixed doubles title at the 1980 Wimbledon Championships, partnering her brother John. She won the 1980 WTA Tour Championships and the year-ending 1981 Toyota Championships, both in singles.
Austin remains the youngest US Open women's singles champion (aged 16) and the youngest inductee into the International Tennis Hall of Fame (aged 29). A series of injuries and a serious automobile accident in 1989 cut short her professional career.