My goal is to be No. 1 and to win Grand Slams.

I believe I have quality, and that's why I won a grand slam, so I know I can do it again.

I'm very easy-going off court, but I really want to win once I'm walking on to the court.

I used to always want to play the perfect match, and this meant not losing a point. The realisation came around the time I was 19 years old, in the French Open final in 2007. This was a key period in my career. I was told I was going for too many winners, which was affecting my game.

It was different when I was young, aged 20, playing the French Open. I didn't have so much experience. I just played tennis because I loved the game.

When you have tough times, and when you learn you can't be perfect in every situation, it's hard to accept, you know, because I still do expect that. But you just have to, because, you know, it's not about the situation. It's how you deal with it. You always have a choice.