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.

There is a lot of pressure on tennis players like other sports that are singular like you're not on a team. When all the pressure rides on your shoulders, it can be a lot different. Team sports you share those moments with the teammates. You share the pressures. You share the wins. You share the losses. You have a coach that can change the course of matches. But in tennis you're out there by yourself. There are no caddies. There are no coaches. You do it alone in the arena and I think that ups the ante a little bit.

I knew I was the second-best tennis player in the state of Florida and No. 8 in the United States of America when I was 12 years old and I couldn't tell you what I was in baseball, but I liked my chances in tennis of getting a scholarship to college.

I am there to play tennis and represent the U.S., but I'm also aware that not everyone's going to be able to think that way.

People handle stress in different ways.

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.

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.