Serena and I have done some great career planning, and we're playing really at the peak of our tennis right now. I think tennis has been a sport where people play this insane schedule from 14 years old, so of course at 26, it's over. We've really paced ourselves.

I will always be the older sister. That's never going to change.

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 try to update as much as possible. You don't want to be in the past.

Id like to imagine that in order to beat me a person would have to play almost perfect tennis.

I'm this overachiever type, I'll just work and work and I'll just do it over and over and over again.

I know I'm good at tennis. Other than that, everything else is a wild card. I'm a wild card.