Youngest Grand Slam singles winner on all three surfaces (female)

Steffi Graf (Germany, b. 14 June 1969) was 19 years 18 days old when she won the first of her seven grass-court Wimbledon singles titles on 2 July 1988. Previously, she had won her maiden Grand Slam title on the clay at the French Open on 6 June 1987, and had triumphed on the hard courts at the Australian Open on 23 January 1988, at the start of her historic “Golden Slam” year in singles – winning all four Grand Slam tournaments and Olympic gold in Seoul, South Korea.

Graf became the fourth three-surface female Grand Slam winner, after Chris Evert (1978), Martina Navratilova (1983) and Hana Mandlíková (1985; previously the youngest woman to achieve the feat, aged 23 years 200 days). Subsequently, it has also been done by Serena Williams (2002), Maria Sharapova (2012), and wheelchair players Jiske Griffioen (2016), Diede de Groot (2019), and Ashleigh Barty (2022).