I am so honored to be named as one of Time's 100 most influential people.

At that time, I feel sad, and I feel no one knows how hard I work and how many tears. They only know the score. At that time, I feel very lonely because no one understands since they haven't been world No. 1 before.

It's hard to always be on top. You go down, you go up.

When you play good, everything is good, but when you dont play so good, everything is bad. Even when you think there are good things, they still say bad things.

Although I have won many times now, each time when I have a lead, I start to think about winning. It's very difficult not to think about winning. Every time, there are new challenges. Every time, there are new issues to overcome.

I think to be 'tough' means you look relaxed. So you have to be tough to win tournaments. But you don't want to be so tough on yourself.

We always learn more from the losing than the winning.