I still feel like my game is very dangerous. I always will have my serve.

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.

Throughout my career, my mind rarely wandered, and I was never sidetracked by distractions, no matter what I was going through off the court.

Once the fifth set comes, it's a matter of nerves.

I may be a step slower than I was before reaching 30, but I'm doing all the right things. I guess there are some guys who would take it easy in the latter part of their careers, but I'm stepping it up.

There's always one shot that I can rely on when I'm not hitting the ball that well, is my serve.

For so long people have just taken what I do for granted. It is not easy to do year-in, year-out, to win Grand Slams and be No. 1.