Novak Djokovic heads to the U.S. Open chasing a record 25th Grand Slam title, but his latest bid for history carries renewed questions over whether his 39-year-old body can withstand perhaps tennis’s most punishing fortnight.
The four-times U.S. Open champion has reached a men’s record 10 finals in New York. Another title at Flushing Meadows would take the Serbian beyond Margaret Court’s 24 major singles crowns and give him sole
