Martina and I went through a very bad five years. Everything's very good between us now, but it was a long haul.

I think it's really important to have portion control. I don't believe in losing weight quickly.

I always listen, I ask children, I even ask adults in tennis, "What are your children playing?" And most of the time it's not tennis. It's pathetic.

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

Reputation is what others think about you. What's far more important is character, because that is what you think about yourself.

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.

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.