There were times when deep down inside I wanted to win so badly I could actually will it to happen. I think most of my career has been based on desire.

You can't give up! If you give up, you're like everybody else.

Single-mindedness. I hate to say it because I don't think it's the best thing for developing a person, but the single-mindedness - just concentrating in the one area - that's what it takes to be a champion.

Being famous before you've formed your personality, before you have that self-esteem, is dangerous.

Relationships are give-and-take, and when you're a tennis player, you're certainly not giving. You have to be self-absorbed. It has to be about you.

Not every child is cut out for an individual sport.

I've had a lot of fear in my life, from fear of flying to fear of making a speech in front of a lot of people.