In an interview to Economic Times, the eight-time Grand Slam winner Andre Agassi was asked who he thought was the best player of all time. The American legend said: "If somebody is playing their best tennis - which is different from the Best Of All Time - let me make that clear, then.

The highest standard of tennis I have ever seen is when Novak (Djokovic) is playing his best tennis. The single level, for whatever my tennis IQ is worth, is an unmistakable standard to which everybody will strive to be. It doesn’t mean he has maximized it, but he is not done.

I think (Roger) Federer has made more of his career than anybody else. He’s more versatile than anybody. He could have won Grand Slams by serving and volleying only, or if not allowed to come to the net, he would have still figured out a way to win."

Agassi also spoke about how he makes investments in start-ups: "I have a portfolio that is well diversified… I have my more high risk investments that I personally engage with. Outside of that, I am happy to listen to any investment as a passive investor.

But there are one or two areas that I really connect with – like maybe education or sports – where I take a much more aggressive position – investing my time as well as money. I bet on people, not on things… A good idea can get screwed up and an average idea can really become something special because of people."