There is no doubt about how hard it is to stay on top in any sport, but to do it in an individual sport for the majority of your career, it is not easy.

Choking is being in a position to win, and then experiencing some critical failure of nerve or spirit. That never happened to me. And I can't help but think it was because I was never afraid to lose.

Players aren't quite as intimidated by my name.

I'm not going to give in to the critics. I'm going to stop on my own terms, not on when someone else thinks I should.

If Davis Cup was a little bit less or once every two years, I would be more inclined to play. But the way it is now, it is too much tennis for me.

When I committed to playing a little tennis in some exhibitions, it was the best thing for me. It got me in shape. It got me out of the house. It got me doing something I love to do.

After I went through two years of not winning an event, what kept me going was winning one more major. Once I won that last U.S. Open, I spent the next six months trying to figure out what was next. Slowly my passion for the sport just vanished. I had nothing left to prove.