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

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

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

My first U.S. Open I think was just very special for me because that was sort of the beginning of what was a 'Cinderella' story for me.

After being at the top, I don't think I could play senior tournaments, because you know how good you were. I don't know if I would enjoy that, being half of what I was.

In tennis, at the end of the day you're a winner or a loser. You know exactly where you stand... I don't need that anymore. I don't need my happiness, my well-being, to be based on winning and losing.

Don’t let a first-set victory lead into a second-set slump