https://kids.guinnessworldrecords.com en

Youngest winner of a Grand Slam singles title (open era, male)

Youngest winner of a Grand Slam singles title (open era, male)
Who
Michael Chang
What
17:109 year(s):day(s)
Where
France (Paris)
When
11 June 1989

The youngest male to win a Grand Slam singles title in the open era (i.e., after 1967) is Michael Chang (USA, b. 22 February 1972), who triumphed at the French Open at Stade Roland Garros in Paris, France, on 11 June 1989 at the age of 17 years 109 days.

Swiss ace Martina Hingis (b. 30 September 1980) holds the absolute open-era record of 16 years 117 days, upon winning the Australian Open on 25 January 1997.

The youngest person ever to win a Grand Slam singles title was Charlotte "Lottie" Dod (UK, b. 24 September 1871) who won Wimbledon on 6 July 1887 at the age of 15 years 285 days.

Tokito Oda (Japan, b. 8 May 2006) became the youngest wheelchair singles Grand Slam winner when he won at the French Open on 10 June 2023 aged 17 years 33 days.