Novak Djokovic retired injured after losing a gruelling first set of his Australian Open semi-final to Alexander Zverev, leaving his bid for a record 25th Grand Slam crown in tatters on Friday.

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.

The club are splashing the cash even as they wait to learn the outcome of a major disciplinary case.