Tennis has given me so many opportunities, and I feel very lucky to have achieved whatever I have, especially coming from a country that does not have a great history in the game.

Coaches were all saying that I was really talented and I had potential, but coming from Serbia, it wasn't easy. The '90s were the hardest years for our country - we went through two wars.

Everyone wants to be happy - people find happiness in different ways. While you want to pursue your career 100 percent, I think it is very hard to give 100 percent in something else. It's important to find this balance, and priorities change throughout life.

I think it's better not to mix professional life and personal life - although it is hard.

My advice to fledgling entrepreneurs is always the same: build a company that you plan to be with for the next 10 years - that is the best way to increase your chances of success.

I recognise life is like a magnet. Positive and negative are on the opposite sides of the magnet. You can try to cut the negative part off, but it's still there. When you accept both of them, it's like, 'You know what? Don't get too identified with success or too identified with failure - just be cool with them.'

Sometimes, success almost haunts you. You want to be the best at everything you do and know you have to work hard.

So it's joyful to me, in my 71st year, to be able to be in a play that is absolutely right for my age and my experience, and that is a popular success. What more could you ask as an actor?