Facing Sinner reminded Alexander Zverev of trying to solve the challenge presented by the 24-time major champion Djokovic.

Novak Djokovic has retired from his Australian Open semifinal against Alexander Zverev after losing the first set in a tiebreak. Djokovic missed a regulation putaway volley on top of the net down 5-6,

It's the second time in the past four Grand Slams that Novak Djokovic needed to abandon his spot in the latter stages of the bracket.

Novak Djokovic posted a scan of his injured left hamstring on social media early Sunday, more than 24 hours after being booed at the Australian Open when he quit playing one set into his semifinal.

Novak Djokovic pledged to continue his hunt for a record 25th Grand Slam title as he processed the disappointment of retiring from Friday's Australian Open semi-final due to a muscle injury.

Serbia's Davis Cup captain Viktor Troicki has sensationally declared Tony Jones should be "banned for life" for his treatment of Novak Djokovic at the Australian Open. And women's champion Madison Keys has been barred from playing her planned next tournament because her ranking is now too high.

Former Serbian tennis star Viktor Troicki says the Australian Open crowd booing an injured Novak Djokovic was a plain disrespectful and disappointing move. Moments after Alexander Zverev won the first set 7-6 (5) which lasted an hour and 21 minutes, the record 10-time Australian Open winner walked to the net and retired.

An injured Novak Djokovic quit after dropping the first set of his Australian Open semifinal against Alexander Zverev on Friday.

Serbian Davis Cup captain Viktor Troicki hits out of Australia's treatment of Novak Djokovic and calls for journalist Tony Jones to be banned from tennis for life.

Despite a remarkable tennis career so far, 24-time Grand Slam champion Novak Djokovic has faced his fair share of controversies, which have led to some fans hating him. He was recently booed by fans at the Australian Open after he withdrew from the semi-final against Alexander Zverev.

Novak Djokovic remains one of the best tennis competitors today. At the age of 37, we have yet to see a decline in the Serbian star’s level of performance.

Serbian Davis Cup captain Viktor Troicki has demanded Channel Nine commentator Tony Jones be banned from covering tennis for life following controversial comments about Novak Djokovic at the Australian Open.