Sometimes when you're putting the work in it just seems so, so hard, and you never know when that work's going to pay off.

When you're going through tough moments, you never know when you're going to have good moments.

I’ve been playing against older and stronger competition my whole life. It has made me a better tennis player and able to play against this kind of level despite their strength and experience.

If you think you know where you're going to be 10 years from now, that's where you're at now. You're just putting it off.

I can't please everyone. That's not in my J.D., you know, not in my job description.

I was very disappointed (at the U.S. Open), and I went out there and I worked really hard.