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

Ninety percent of my game is mental. It's my concentration that has gotten me this far.

When I play, I'm boiling inside. I just try not to show it because it's a lack of composure, and if you give in to your emotions after one loss, you're liable to have three or four in a row.

The difference is almost all mental. The top players just hate to lose. I think that's the difference. A champion hates to lose even more than she loves to win.

Not every child is cut out for an individual sport.

I always looked ahead.

To be a tennis champion, you have to be inflexible. You have to be stubborn. You have to be arrogant. You have to be selfish and self-absorbed. Kind of tunnel vision almost.