You can't dwell in your past but move forward, look forward. That's it.

One day my dad would say, 'OK, if you want to play tennis I can help you out.' And that's how it started. And I had a goal. I wanted to beat my mom first. And my parents and my brother. And that was the ultimate goal.

The only one I feel pressure from is myself to go and give my all for every match and, obviously, I'm a competitor.

The fact is I still have quite a few good years in front of me. I still improve.

I like Twitter a lot. It is a great way to get the fans knowing another side of you.

I don't really spend money like crazy. I buy what I need and what I really want, and if I'm buying expensive things I do think about the purchase many times before I buy it.

To be the world No. 1 has always been a dream for me.