My serve can get better, for sure. It's not just about serving bombs, but positioning, variation in speed, in spin.

I have lived my whole life with high intensity.

I would love to learn other languages, maybe French? My uncle speaks German so maybe also German? Chinese seems to be too difficult.

I've stayed calm when I'm winning and I've stayed calm when I've lost. Tennis is a sport where we have a lot of tournaments every week, so you can't celebrate a lot when you have big victories, and you cannot get too down when you're losing, as in a few days you'll be in the next tournament and you'll have to be ready with that.

The US player Andy Roddick reaches speeds of 220 kilometers per hour when he serves. If I train with him every day, I will later be at an advantage against a player whose service crosses the net at 190 kilometers per hour.

Losing is not my enemy..fear of losing is my enemy.

My motivation and aspiration is the same, being number one or being number five. So that's the truth. And my goal is the same - it's to always be happy playing, it's to enjoy the game and improve always.