America is the world's policemen, whether you and I like that or not. That's a fact. People globally feel that.

I will do everything in my power to make sure people are aware that our team is out there fighting the good fight for the tennis fans of the United States.

Focusing on one thing can be tough, and people with fewer options are more apt to concentrate on what they're doing. There's probably something to hunger.

Even the poor can be fat in the U.S. That says something about a country. That's how incredible what we have is. But it can also take away incentive.

Fear is an interesting energy that we all have to face. Some people step up and aren't afraid but still come up short. And some would rather cop out: "My shoulder hurts" or "I didn't give it my all." They can sleep at night.

I've been lucky enough to primarily work for myself over the years.

When I turned professional, what I was really aiming for was to be in the top 100, try to hold the top 100 for ten years, and just be in the show, and have a nice career. It's more than I could have ever hoped for. I worked awfully hard for it, but there are other people who worked just as hard and didn't get the breaks. I recognized that I've been lucky and being able to live this life that I wanted since a young age. I really went after it with everything that I have and somehow it worked out.