Novak Djokovic’s endurance could face grueling test at U.S. Open

Another title at Flushing Meadows would take the Serbian beyond Margaret Court's 24 Grand Slam singles crowns and give him sole possession of the all-time record.

NEW YORK, Aug 26 : 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 Ne