Losing hurts me. I was determined to be the best.

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.

I still have this image: I can't be controversial, I can't say things.

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.

If you're a champion, you have to have it in your heart. You can have the greatest coaches in the world, all the opportunities to play, and the greatest equipment, but if you don't have it inside, you're not going to make it. On the other hand, if you don't have any of those luxuries but you have heart and courage and the guts to go out there and grind it out, then you'll make it.

When I was younger, I was a robot. Wind her up and she plays tennis.

If you can react the same way to winning and losing, that's a big accomplishment. That quality is important because it stays with you the rest of your life, and there's going to be a life after tennis that's a lot longer than your tennis life.