Definitely sport matures you, if you let it. It definitely makes you grow up because you have to work so hard that if you can't, then you probably aren't going to have the mental capacity to handle it all. That probably played a role in growing up a little faster than maybe other people.

When you get into that habit of winning, it gets - I don't know if you call it contagious - but it gets to be a habit. She's developed an unbelievable habit.

Tennis is mostly mental. Of course, you must have a lot of physical skill, but you can't play tennis well and not be a good thinker. You win or lose the match before you even go out there.

I think I can change the game.

In my mind, I'm always the best. If I walk out on the court (and) I think the next person is better, I've already lost.

I remember watching the Olympics at home as a kid. It was one my Dad's dreams to win an Olympic medal.

I have a lot of dreams, and most of them come true these days.