The Serb is the most successful man in Australian Open history, but he’s just as dangerous in the lead-up to the first major of the year.

Approved on tour but barred at Slams, the health tracker controversy exposes the sport’s complicated rulebook.

Tennis star Naomi Osaka made a surprising decision amid the Australian Open tournament after her happy start. The update came late Saturday in Melbourne about two hours before the pair were expected ...

Tennis star Naomi Osaka, 28, walked onto the court in an attention-grabbing outfit for her match at the Australian Open today. For Osaka’s match against Croatian player Antonia Ružić, the four-time ...