Oldest tennis Grand Slam singles winner (male, open era)
- Who
- Ken Rosewall
- What
- 37:62 year(s):day(s)
- Where
- Australia (Melbourne)
- When
- 03 January 1972
The oldest tennis Grand Slam singles winner (male, open era) is Ken Rosewall (Australia, b. 2 November 1934), who was aged 37 years 62 days when he won the 1972 Australian Open at the Kooyong Lawn Tennis Club in Melbourne, Victoria, Australia, on 3 January 1972.
Rosewall defeated Malcolm Anderson 7–6, 6–3, 7–5 in the final match of the tournament.