Tennis taught me so many lessons in life. One of the things it taught me is that every ball that comes to me, I have to make a decision. I have to accept responsibility for the consequences every time I hit a ball.

Bobby Riggs was one of my heroes. I admired him. That's one of the reasons I beat him - because I respected him.

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

I like to see what future generations are thinking about.

Don't let anyone define you. You define yourself.

When people tell you not to believe in your dreams, and they say “Why?”, say “Why not?

Sports are a microcosm of society. It just shows how much more competition there is in the world.