I had to pay an incredible amount to get insured on it and, after a couple of weeks of driving it around, I realised it wasn't quite my style. I'm not flash by any means but a bright red Ferrari is a definite head-turner and I hated that. It was also incredibly impractical, particularly when it came to finding space for a friend or for my tennis bag, so I decided to sell it after a few months.

I first had money for investment just at the time of the 2008 crisis and shares have been highly volatile since then. So I do have shares in my pension but I have tended to invest in specific projects that include property and private companies that have been very well researched by my advisers.

When I'm training in December, I have to eat like 6,000 calories a day to maintain my weight. It's a bit tiring.

There is a fear of emotion in tennis.

I don't play any tournaments to come second best.

It's always nice to get good feedback, and a bit of encouragement can go a long way.

Of my investments that have been realised, buying my first house turned out to be a pretty good move, which I didn't really realise at the time.