استقامت نواک جوکوویچ ممکن است با آزمون طاقت فرسایی در یو اس اوپن روبرو شود

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.