If you can react the same way to winning and losing, that's a big accomplishment. That quality is important because it stays with you the rest of your life, and there's going to be a life after tennis that's a lot longer than your tennis life.
“I do what I did as a hobby as a kid, you know, and make a living at it. And I just feel like I'm one of the luckiest guys in the world 'cuz I get paid to make toys and play with them.”