Madison Keys

Serena's always been one of the best, and she will forever be one of the best tennis players in women's tennis.

I think my biggest thing is learning when to hit which serve when, not doing the exact same thing over and over. Because O.K., great, it's 120 miles per hour, but they're standing right there, and they just block it back.

It's one of those things where eventually in your career, it kind of switches from being the young up-and-comer to someone who has had results and the other person is trying to raise their level to play. I think it's a privilege.

Setting a goal, accomplishing it, and feeling good about yourself can help build confidence and perseverance.

I make a little goal every day and work toward achieving it - even if it's the smallest little thing.

People aren't winning Slams at 21 anymore. It's later.

For me, losing is definitely not easy, but I think you just have to keep everything in perspective. Just remember that there's another tournament around the corner.

When you're 13 or 14, sometimes you wake up in a bad place. You feel like everything's out of your control. You don't know what to do.

It's not the end of the world if I lose. I try to keep it all in perspective.

I could go through my Twitter account right now and there would be 10 horrible messages.

I grew up by the Mississippi River, and I would swim in that as a kid.

Accept others for their differences, what makes them different. That's what makes the world the world.