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

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.

Now that I'm losing some, I can see how tough I was -- the killer instinct, the single-mindedness, playing like a machine. Boy, that's what made me a champion.

I'm not an overly ambitious person; I don't feel like I have to excel.

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.

I always looked ahead.

Once you've been number one, you can never be satisfied with less.