Australian Open: Novak Djokovic medically retires after first set in semifinal vs. Alexander Zverev
USATSI Novak Djokovic is out of the Australian Open in gorgeous vogue. The 24-time slam champion medically retired instantly after dropping the primary set of his semifinal match towards No. 2 Alexander Zverev in a tiebreak 7-6 (5). It is the primary time Djokovic has ever retired in a serious. Because the clip above conveys,…