Your parents were in Auckland for the 2012 tournament - do they often travel to watch you and will they be here again?
They won't be in Auckland this time. They normally travel to watch me in the Grand Slams except for the Australian Open.
Do you set specific goals each season - if so, what might be your 2013 aims?
My coach and I haven't talked about those yet but I will know more by the time I get to Auckland.
What is the best match you have ever played?
I can't pick out one particular match - but I've had good ones against Sam Stosur and also Maria Sharapova one year in Melbourne. What is most important for me is that I am satisfied with myself and give it all on the court.
Your worst moment in tennis?
There are always ups and downs in a career. So far I have improved every year which is a great achievement for me because I feel I am getting closer to the top each time. But I have had some rough months every season and that is what I am working on fixing.
What is your favourite tournament and why?
I love Melbourne and the Australian Open, which is special for me. It is far away from home but it feels like home with so many great people there. Auckland is among the many tournaments where I feel well treated. The organisation in Auckland is amazing and it feels like a big family there. I also like the Stuttgart tournament, not just because I won it - it's just amazing, the food, the arena. It's also the only German tournament left.
Who was your childhood hero?
Martina Hingis - I loved the way she played.
You have played Serena Williams twice - what stands out about facing the tennis legend?She killed me once but I had some real chances on the other occasion. You always want to face the best players and compete against them but you don't want to forget that it is just another woman you are playing against. Sometimes you can think too much about their reputation and success. It is always an honour to play against those legends and you always take something out of the match ... and must always believe you can win.
Is there one thing you would like to change in tennis?
Sometimes it would be nice to reduce the amount of travel although that's not really possible and it is your job, and a great job. But travelling across time zones a lot and flying long distances then playing the next day - it can be very tough and destroys your body sometimes.
What is the best advice you have received?
Play to win. Nothing is impossible, and give it all you have.
If you weren't a tennis professional, what would you be?
I would probably work in an office, in a hotel maybe, as I like computers and doing tax stuff and writing bills and stuff like that.
Your hobbies?
Hanging out with friends and family and shopping. I like watching sport such as German soccer - I am a huge fan of Bayern Munich and love biathlons.