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

You've got to take the initiative and play your game. In a decisive set, confidence is the difference.

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.

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

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.

If I win seven tournaments in a row, I get so confident I'm in a cloud. A loss gets me eager again.