Djokovic sustained a muscular injury in his titanic tussle with Carlos Alcaraz earlier this week, and came onto the court at Rod Laver Arena on Friday with heavy strapping around his left leg.

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

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Spectators booed an injured Novak Djokovic as he left the court in Rod Laver Arena after quitting one set into his Australian ...

Injured Djokovic decides not to continue after losing first set as Zverev reaches his first Australian Open final ...

Novak Djokovic was subject to boos from some fans after he was forced to retire injured from his Australian Open semifinal ...

Zverev, who is seeking his first Grand Slam title, admonished the crowd a bit for the reaction during his on-court ...

On Friday, Djokovic battled World No. 2 Alexander Zverev for 81 minutes in their semifinal match. However, Djokovic immediately retired after losing a 5-6 tiebreak in the first set.

Djokovic, who retired due to injury after the first set, was booed by the crowd as he walked off Rod Laver Arena.