In the last 24 years that I have played for India I have made new friends, and before that I have had friends from my childhood. They have all had a terrific contribution. As and when I have called them to come and bowl to me at the nets, they have left their work aside to come and help me. Be it joining me on holidays and having discussions with me on cricket, or how I was a little stressed and wanting to find a solution so I can perform better. All those moments my friends were with me. Even for when I was injured, I would wake up in the morning because I couldn't sleep and thought that my career was over because of injuries, that is when my friends have woken up at 3 o'clock in the morning to drive with me and make me believe that my career was not over. Life would be incomplete without all those friends.

Tree planting became a natural choice to address some of the initial basic needs identified by women. Also, tree planting is simple, attainable and guarantees quick, successful results within a reasonable amount time. This sustains interest and commitment.

Of all the gifts that tennis has given me over the years, the greatest, without a doubt, has been the people I've met along the way: my friends, my competitors, and most of all the fans who give the sport its life.

Sherry offered me a list of research options: the one project that intrigued me the most consisted of finding out the environmental fate of certain very inert industrial chemicals – the chlorofluorocarbons (CFCs) – which had been accumulating in the atmosphere and which at that time were thought to have no significant effects on the environment. This project offered me the opportunity to learn a new field – atmospheric chemistry – about which I knew very little; trying to solve a challenging problem appeared to be an excellent way to plunge into a new research area.

When deciding whether to do something, if you feel anything less than “Wow! That would be amazing! Absolutely! Hell yeah!” — then say no.

And this is my only pair of pants. These three glasses, I don’t even think about it because I just think about having enough.

My mentor heard it and said, “Derek, you’re just not a singer. You really need to stop trying. Admit you’re a songwriter, and find a real singer.”

So for years I kept calling myself an entrepreneur until one day I realized like, wait a second, this is expired! Like somebody who is an athlete in high school can’t keep calling himself an athlete forever.

The proudest achievement of my life at that time was that software. Wonderfully organized, extensible, and efficient: the culmination of everything I’d learned about programming in ten years. After a successful relaunch and Christmas rush, I was looking at my plan for 2008 and beyond. All my plans needed a huge effort for little reward, but were required for future growth. I had broken it into about 20 projects, each taking 2 to 12 weeks. But I wasn’t excited about any of them.

When I decided to sell my company, I already had enough. I live simply. I don't own a house, a car, or even a TV. The less I own, the happier I am. The lack of stuff gives me the priceless freedom to live anywhere anytime. So I didn't need or even want the money from the sale of the company. I just wanted to make sure I had enough for a simple comfortable life.