Djokovic retired hurt in his Australian Open semi-final against Daniil Medvedev after struggling with a muscle tear in his upper leg, having been in obvious discomfort throughout the opening set.

A leading tennis expert had pinpointed the benefits that Novak Djokovic was enjoying with Andy Murray as his coach before his shock retirement from the Australian Open on Friday. Djokovic called it quits after dropping the first set against Alexander Zverev,

Novak Djokovic and Andy Murray maybe didn't kick off their partnership with a triumph but Nick Kyrgios still thinks that the Briton did "an incredible job" in his coaching debut.