In tennis you move a lot. Golf you don't. In tennis, you can have a bad half-hour, but you can't in golf. You can lose the first set in tennis and still win.
You know, I think when I reflect on it, I think there's certainly a sense of history. When you have ambitions to play this game, you want to be one of the best ever, and you want to play so well and be so effective that you want people to remember your name 100 years from now.