Getting to number one in the world without a coach is highly unlikely.

You have to be extreme to be exceptional. I couldn't revel in being number one. I had to get to zero. When my fitness was at its peak, I was intimidating. I made guys cave in. They'd be dejected in the locker room after matches, and I'd go out for a run, as if it wasn't enough. I'd rub it in their faces. I meant to do that.

We lose a lot of young athletes because tennis is such a difficult sport. It's not like kicking a soccer ball.

Fear is an interesting energy that we all have to face. Some people step up and aren't afraid but still come up short. And some would rather cop out: "My shoulder hurts" or "I didn't give it my all." They can sleep at night.

The good news is I have time.

There's a reason why Federer and Nadal are so gracious when they lose. They sleep well at night knowing that they've given their best.

Trophies separate the winners from losers, and life is about winning and losing. Go into business and you see. You're competing every day.