You can kick a ball into the net, throw a basketball into the net. Tennis is complicated. It'll make a lot of great athletes run the other way because they can't be successful initially.

People handle stress in different ways.

There are certainly great cities in America that don't have ATP and WTA events. Our fans are very provincial. They want American champions.

What separates the winners from the losers is that they can deal with doing their best while still coming up short.

You can look directly at the NFL and see how successful they've become because they have central control, central voice, and it doesn't mean that the owners don't have a say, but the commissioner runs it, and he's the one who speaks for them when they go out and do commercial deals.

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.

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.