Davis Cup, you know, does take a lot out of you over the weekend. It's tough, especially if you play all three days.
Against Steve Johnson at the Olympics I was down a couple of times.
Obviously I would have loved to have won, but I have had a good run every match.
I'm incredibly fortunate and it's important to me to make sure that I give back where I can.
I'm a global ambassador for the World Wildlife Fund and United for Wildlife and I am also a Unicef UK ambassador. It's important to me to support charities. I never want to take my wealth for granted.
I've always been pretty careful at keeping track of my spending, so using my debit card is often the easiest way of doing that.
It's always nice to get good feedback, and a bit of encouragement can go a long way.
Tipping generally changes depending on where you are in the world. In Britain you don't always have to tip, but I always make sure I do. I have a lot of respect for waiters and waitresses - it can't be an easy job and they often don't get paid huge amounts, so I think it's important to reward them and let them know if they are giving great service.
When I started to do quite well on the tour I thought I'd treat myself to a bright red Ferrari. I had always had a soft spot for them as a car brand and, when I was in the position to afford one, I decided to go for it.
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.
It's safe to say that the value of the property had shot up considerably and in the end I made a pretty satisfying profit.
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.
I'll never pay above the odds for something if there's a more cost-effective alternative, so I guess that's where the saver in me shines through.
I was pretty young when I bought my first place, and at that time didn't really view it as an investment. After living there for a few years I decided to move out of London, so I decided to rent it out for a few years. Then, as the property market continued to rise, I made the decision to sell.
Every week I'll be spending money on flights, accommodation, stringing and even things as simple as taxis, meals out and, of course, paying the other members of my team. I'm still very careful, though, with what I'm spending.
I wouldn't say I'm a spender in the sense that I'm going out on huge spending sprees. However, to be able to function at the top of your game on the professional tennis circuit often requires an element of frequent spending.
I fully understand that not all of the companies will succeed and that there will be losses along the way, but this is very much the norm with early stage investment.
Since there are a wide range of entrepreneurs fundraising at any given time, I looked at each opportunity as it has arisen and on its own merits. Then I've sat down with my financial advisers, we've looked at the numbers and gone for the businesses I believe have real potential.
I decided at the outset to invest in a fairly broad range of businesses, as I didn't want to get pigeonholed into one sector.
Through crowdfunding anyone can find companies and products.Forming a partnership with innovative British businesses was appealing and the opportunity to go on a journey with these companies as they grow, and hopefully share in their future success, is exciting.
I've had an entrepreneurial mindset from a young age and I've been interested in companies and products that are a little bit different.
I like to think I have a good few years left of my career yet, as long as I stay fit and healthy. However, it's always good to have a backup plan, which is why I have been working hard to build my business portfolio outside tennis.
I think it's sensible to plan for the future now I'm a father and a husband.
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.
As soon as I walk through the door and see my family and the dogs, I feel relaxed.
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