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.

I managed it better. This time that wasn't the case," Djokovic said after retiring vs. Alexander Zverev. But failing to defy his body in Melbourne a third time, at 37, isn’t the end of his career.

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Alexander Zverev chided the crowd after they booed Novak Djokovic for retiring due to injury after the first set in an ...

Novak Djokovic retires from his Australian Open semifinal after losing the first set 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 ...