The 38-year-old Swiss national said he needed follow-up arthroscopic surgery after undergoing a similar procedure in February.
The current world number one, Novak Djokovic has 17 Grand Slam titles to his name - two behind Rafael Nadal and three fewer than Roger Federer.
To the delight of fans, happy to discover some hidden facets of their idols, stars from Karim Benzema to the Brazilian legend Ronaldo and even Rafael Nadal, are dropping their habitual discretion to interact live with their millions of followers.
Athletes and celebrities participated an online global music festival organised to raise funds for the purchase of medical supplies and to support fans confined to their homes.
Novak Djokovic admits he was on brink of defeat with dizziness and dehydration before coming through a five-set thriller against Dominic Thiem to clinch title – also his 17th Grand Slam – and return to world number one.
Nobody beats Novak Djokovic at this stage of the Australian Open. At least, not until now. Djokovic is a seven-time champion at Melbourne Park, where he has never lost a final or semifinal he has contested.
Dominic Thiem will face Alexander Zverev for a place in the final, a match-up scarcely imaginable at the start of the tournament, after beating Rafael Nadal.
The 33-year-old was in virtuoso form to charge past the 27th seed 6-1, 6-2, 6-4 in hot sunshine on Rod Laver Arena and make the round of 16 at Melbourne Park for a 13th time.
David Goffin claims an upset 6-4 7-6 (3) victory over world number one Rafael Nadal in Sydney to keep Belgium alive in their quarter-final clash at the inaugural ATP Cup team event.
Casper Ruud, a product of Nadal's tennis academy in Mallorca, has beaten top-20 players John Isner and Fabio Fognini to make his mark at the international teams tournament in Australia.
Novak Djokovic and Rafael Nadal urged organisers of the ATP Cup and Davis Cup Finals to consider a possible merger, saying it makes little sense to have two men’s team competitions on the tennis calendar.
Big pay rises are in store for players at January's Australian Open with organisers announcing a boost in the total purse to almost $50 million.
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