You're right about Borg McEnroe. I was playing a lot back then and I had an aversion to McEnroe because of his behaviour on court, but later I began to realize how gifted he was with his racquet. Probably the best hands ever in tennis. Borg to me was a machine. Extremely fit, the world's best backboard and he packed it in far too soon. Laver was more dominant than Federer, in a very competitive era. Oh to speculate the possibilities.