Novak Djokovic has posted a scan of his injured left hamstring on social media more than 24 hours after being booed at the Australian Open when he quit playing one set into his semifinal because of what he said was a torn muscle.

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

Former World No. 1 and now a well-known podcaster, Andy Roddick, has issued a warning to Novak Djokovic regarding his latest injury struggle. The American believes that the Serbian’s muscle tear could mark the beginning of the end for the 24-time Grand Slam champion.

Novak Djokovic is 37 and was forced to stop playing because of an injury at two of the past four Grand Slam tournaments.

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,

Djokovic is only interested in tennis' biggest prizes. He still has the game to win them, but at age 37 his body is letting him down

Novak Djokovic’s quest for a record 25th grand slam title has been cut short at the Australian Open after he stunningly retired from his semifinal match due to a left leg injury.

Alexander Zverev urges fans not to boo Novak Djokovic, who retired in the Australian Open Semifinals due to injury

Alexander Zverev had a classy response to Novak Djokovic's medical retirement on Friday. Zverev won the first set of his semifinal match against Djokovic

Manchester City will not win the Champions League this season. There, I’ve said it. Somebody had to. As City clambered desperately aboard the last lifeboat off the titanic climax to UEFA’s catchily-named League Phase, the other survivors all cursed quietly under their breath. Nobody wants Guardiola in Friday’s bracket draw.

World number six Novak Djokovic has pulled out of Serbia's Davis Cup first-round qualifying tie due to injury, the country's tennis federation (TSS) said.