Me, I don't need money.
I didn't change the world.
I'm not a materialistic person.
There wasn't a rich father or rich family that paid for everything that I have right now, so I worked my way.
Roger [Federer], he brought tennis... one level higher. Normally he toys with everybody. With all respect to other players, he does whatever he wants on the court against them. It's incredible what kind of game he can play.
I was making comebacks every single year. That makes it difficult mentally. It causes a lot of stress.