I went on the courts with just a ball and a racket and a hope...and that's all I had.

Tennis is my job, but it's not my life.

It's amazing, but I guess that happens when you become overly famous. Every week now, I get more famous.

To this day, I don't love my arms. People want more fit arms, but my arms are too fit. But I'm not complaining. They pay my bills.

If you can keep playing tennis when somebody is shooting a gun down the street, that's concentration.

I don't go thinking I'm going to lose. I never go into a tournament thinking that. I'll do the best that I can.

If I'm not playing well, I do get down on myself because I am a perfectionist. [So I need] someone who believes in me more than I believe in me, someone willing to work as hard as I work. I don't understand what no means or what failure means; I only understand what yes means and try again means.