Competitive toughness is an acquired skill and not an inherited gift.
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.
Once you've been number one, you can never be satisfied with less.
If you're a champion, you have to have it in your heart.
Ninety percent of my game is mental. It's my concentration that has gotten me this far. I won't even call a friend on the day of a match. I'm scared of disrupting my concentration. I don't allow any competition with tennis.