I always think it's best to pretend you're in a tenuous position. Just as a player, you always want to stay in the now and work hard but also have goals for the future. There's no promises in any entrepreneurial business. You have to really work hard every year and also try to envision where you want to go in the future at the same time.

I got to see the best players in the world every year the week after the U.S. Nationals, which is now known as the US Open, in Los Angeles. That made a huge difference in my life.

I knew after my first lesson what I wanted to do with my life.

The main thing is to care. Care very hard, even if it is only a game you are playing.

I think self-awareness is probably the most important thing towards being a champion.

When I was playing, we didn't have to compete against everybody in the world. Now it's a truly global sport, so the competition's much greater, just like it is for our children in every other area, whether it be in science or technology or whatever you talk about.

Champions take responsibility. When the ball is coming over the net, you can be sure I want the ball.