I haven't had a cramp since '99. That was my only time, in Davis Cup, when I was panicky. I was young. I'm very proud of that. Never pulled out. Never had cramps. Never lost very much because of fitness, especially later on in my career where I knew I've put in the hard work. I've done that. I've been very fortunate and clever as well to understand how I need to work, when I need to work. So I'm very happy to have stayed injury free for so long. I hope I can still maintain a few good years on the tour. I really hope so.

My dad said if you become a tennis professional just make sure you get into the top hundred, because you have to make a little bit of money. You make a living so you can pay your coaching and, you know, your travels.

The serve, I think, is the most difficult, you know, in terms of coordination, because you got the two arms going, and you got to toss it up at the right time so.

I'm as patient a father as I am on the tennis court. It takes a lot for me to get really upset, but sometimes kids can get you really cross if they really keep bugging you.

I used to get nervous, you know if my parents would come watch. And then I would get nervous if my friends came and watched. Today it's not a problem anymore actually, because now I enjoy it. I see that they, you know, respect me immensely, and I try to put on a good show and show that I can still play very good tennis.

I always believe if you're stuck in a hole and maybe things aren't going well you will come out stronger. Everything in life is this way.

My wife doesn't like Football but she watches it just for Messi.