Arthur Ashe comes to mind general masterclass.
who is the oldest to win RG?
Correct general hercules. Here are the oldest players to win the majors in the Open Era.
RG (clay):
Andres Gimeno (1972)- 34y 10m 1d
WC (grass):
Arthur Ashe (1975) - 31y 11m 25d
USO (grass):
Ken Rosewall (1970) - 35y 10m 11d
USO (hard): Pete Sampras (2002) - 31y 0m 27d
USO (clay): Manuel Orantes (1975) - 26y 7m 1d
AO (grass):
Ken Rosewall (1972) - 37y 2m 1d
AO (hard): Andre Agassi (2003)- 32y 8m 28d
Respectfully,
masterclass