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 man….

I'd like to do a lot of things - whether in design or architecture or business..

It's very expensive to be a professional tennis player with all the travel and the flights and the hotels and everything..

I'm thankful to be able to team up with a company like USANA that cares about my well-being and I know we can do great things together..

I have a really wide range of interests and I've still got time to work out my exact direction..

On grass, it can be the small things that decide a match..

There are so many tough opponents out there and tough competitors so I've never liked to look ahead..

I used to always be the young one playing without pressure, but I am just happy to be where I am and enjoying my time..

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

My parents just always taught me to be reasonable..

You feel better about yourself when you do something with yourself. You also feel more confident..

I have a very close relationship with my parents..

I have nothing to lose and think that it's a positive thing that I am young and playing on a good level..

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

There are a lot of things to my game I can still improve, but everyone can..

I love winning. I don't like losing..

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 f….

There's just nothing like playing on Arthur Ashe Stadium. It's truly amazing..

Young players are starting to come up as well and they will see me as one of the older, experienced ones..

I believe the best in people. I believe if you need a bathroom break you go to the bathroom. If you need treatment, you get treatment. I don't think ….

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