As of 2018, who is the youngest inductee of all time to the International Tennis Hall of Fame?

Tracy Ann Austin Holt (born December 12, 1962) is an American former World No. 1 professional tennis player. She won three Grand Slam titles, including the women's singles titles at the 1979 and 1981 US Opens, and the mixed doubles title at the Wimbledon Championships in 1980. Additionally, she won the WTA (Women's Tennis Association) Championships in 1980 and the year-ending Toyota Championships in 1981, both in singles. A series of injuries and a serious automobile accident cut short her career. Since 1979, she has been the youngest US Open female singles champion in history, and she is the youngest inductee of all time at the International Tennis Hall of Fame. Austin won singles titles on all playing surfaces: clay (both red clay and green clay), indoor carpet, grass, and hard courts.

Austin possessed a solid baseline game with a strong forehand and reliable two-fisted backhand. She struck the ball deep, with substantial pace (given the wooden racquet era of her prime), and with pinpoint accuracy, hitting on or near the lines. Often this aspect of her game has overshadowed her solid net game which resulted in a Wimbledon mixed doubles title with her brother John. Austin's first serve was a mid-paced high percentage shot that functioned well on all playing surfaces, and although her second serve has been described as lacking penetration, she rarely double faulted.