Novak Djokovic retired injured after losing the first set 7-6(5) against Alexander Zverev on Friday to put the German through to his first Australian Open final and extend his wait for a record 25th Grand Slam title.

Zverev, who is seeking his first Grand Slam title, admonished the crowd a bit for the reaction during his on-court interview.From NFL plays to college sports scores, all the top sports news you need to know every day.

Novak Djokovic said Friday there was a chance he may have played his last Australian Open after retiring with a muscle tear in the semi-finals to leave his bid for a record 25th Grand Slam crown in tatters.