Some people say I have attitude - maybe I do...but I think you have to.

When you lose, you're more motivated. When you win, you fail to see your mistakes and probably no one can tell you anything.

As long as we're fit, we just have so much to give on the court.

So what if you fail? At least you'll know what not to do when you try again.

There were a lot of people shouting out. I know it's not proper tennis etiquette, but this is the first time I've ever played here that the crowd has been behind me like that. Today I felt American, you know, for the first time at the U.S. Open. So I've waited my whole career to have this moment and here it is. ... It was great. It was awesome. It was like winning gold.

'Oh and Oh' is a tennis term... It's a nice way of saying you took your opponent to pieces.

I have been recently diagnosed with Sjogren's Syndrome, an autoimmune disease which is an ongoing medical condition that affects my energy level and causes fatigue and joint pain.