With Roger Federer already ruled out of the Australian Open it would be a "disaster" if Novak Djokovic and Rafa Nadal do not turn up for the first Grand Slam of the year, Nick Kyrgios said, adding that the sport needs the 'Big Three' to continue playing.

No 'Big Three' would be disaster for Australian Open, says Nick Kyrgios

Rising star Stefanos Tsitsipas only turned 21 last month and is the youngest player in the world's top 10 -- but he refuses to be intimidated. Last weekend, the Greek tyro played doubles alongside Roger Federer and Rafael Nadal at the Laver Cup, the latest step in his fast ascent, although he lost both matches.

Stefanos Tsitsipas won't surrender in pursuit of tennis Big Three

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No 'Big Three' would be disaster for Australian Open, says Nick Kyrgios

Stefanos Tsitsipas won't surrender in pursuit of tennis Big Three