Novak Djokovic throws his ailing 37-year-old body into an Australian Open semi-final against Alexander Zverev on Friday while defending champion Jannik Sinner faces Ben Shelton.

Djokovic and German world number two Zverev are first up at 2:30 pm (0330 GMT) on Rod Laver Arena as the Serbian great closes in on a record 25th Grand Slam title.

Djokovic rolled back the years to defeat Carlos Alcaraz, aged 21, in four sets in the quarter-finals in Melbourne.

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