You know growing up in Sweden meant we had a lot of rain when we played tennis. We were taught on clay courts but because of the weather, we had to go indoors a lot.

It's tough when you're No. 1. You don't have any private life, you can't even walk anywhere. I think that was one reason why I lost my motivation to play tennis.

If you're afraid of losing, then you daren't win.

It has changed, quite a lot. It is very different now, there are quicker men, they are taller, stronger, have great stamina. The balls have also become faster. Tennis has now become a power sport. There is more depth in the game, as well, there are many more players than there used to be. The entire character of the game has changed.

I had a great tennis career. I have no regrets. But to find peace with yourself, and to finally be with your family - I'm probably the happiest guy in the world.

I was fascinated by a compelling character embroiled in a controversial topic that told the story from a different point of view.

You never know how long Federer is going to play, but in my opinion he has at least one or two more grand slams to win. It depends how long he stays motivated. For me, he is the greatest player to ever play the game.