It is very dangerous to have your self-worth riding on your results as an athlete.

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

If they had rankings in baseball, maybe I would have been able to do the math and figure out my chances of being a professional baseball player versus a tennis player. But that was the decision-maker for me, I just thought I was better in tennis.

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.

Us going out there and performing our best. That's how I define success. I'm not going to define it for us by the wins and the losses as much as by the effort and how we handle ourselves.

Tennis doesn't encourage any kind of intellectual development.

There are things we can't control - like the wins and the losses.