The most important words that have helped me in life, when things have gone right or when things have gone wrong are 'accept responsibility.'

In the seventies we had to make it acceptable for people to accept girls and women as athletes. We had to make it okay for them to be active. Those were much scarier times for females in sports.

It's about learning your craft. That's a wonderful thing--especially with today's consumerism and instant gratification. You can'tbuy that. It's about making decisions, corrections, choices. I don't think it's so much about becoming a tennis player. It's about becoming a person.

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.

I feel that tennis is an art form that is capable of moving the players and the audience - at least a knowledgeable audience-in almost sensual ways. When I'm performing at my absolute best, I think that some of the euphoria I feel must be transmitted to the audience.

Tennis is a game of angles. You never have time to figure the angles. It's practiced. It's so practiced that it becomes an instinct. You just know where to put the ball. You just feel it. It has been computed into your brain so many times ­ it is there.

No one changes the world who isn't obsessed.