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

It is the small steps which bring you satisfaction at the end of the day.

There is some moments on the career of everyone that are important ones. Is obvious that first title on clay makes a big difference. After that, I was confident enough to keep going, winning in Barcelona, in Rome, then in Roland Garros.

I have no sense of humor about losing

I'm only superstitious on the tennis court.

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.

You have to accept both losing and winning well. I've stayed calm when I'm winning and I've stayed calm when I've lost.