I don't actually go to that many concerts.

I love music. I listen to a lot of it.

Tipping generally changes depending on where you are in the world. In Britain you don't always have to tip, but I always make sure I do. I have a lot of respect for waiters and waitresses - it can't be an easy job and they often don't get paid huge amounts, so I think it's important to reward them and let them know if they are giving great service.

When I'm training in December, I have to eat like 6,000 calories a day to maintain my weight. It's a bit tiring.

Everything in tennis is so neat and nice but boxing has sport down to its essence; it is very pure and I like that.

It's hard because you want to be able to just, okay, focus your energy on trying to win the match, but you need to then have tactics as to how you're going to deal with how you're feeling.

I'm on the road so much that I don't get to spend as much time there as I would like.