For me, losing a tennis match isn't failure, it's research.

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

If your partner wants to be private, you have to respect that.

Each point I play is in the now moment. The last point means nothing, the next point means nothing.

Don't go into debt and don't spend a lot. It's not how much money you make, it's how much you spend.

I've never cared that much for cementing my place in history. Sports is so transitory, so ephemeral. It just seems like so much nonsense comparing me to Helen Wills Moody or Suzanne Lenglen or anybody else from some other time. One lesson you learn from sports is that life goes on without you.

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