Rosewall already mentioned, and deservedly so. Here's a couple of others from the "way back machine":
Lew Hoad...even more "butter" than Rosie
Ilie Nastase...Grandpa Fed, but a head case
Vitas Gerulaitis...Hopman-infused game was a throwback to Hoad/Rosie
Johan Kriek...was courtside for his QF night match @Armstrong vs Vitas...never saw two guys able to cover so much court in one match...absolute classic!
Despite all of life's bumps and bruises, I'm still committed to making this world better one smile, one laugh at a time, every day!