Novak Djokovic broke down in tears during the deciding set as the Arthur Ashe Stadium crowd rallied around him amid severe physical struggles
Djokovic lost to Mariano Navone 7-6(5), 5-7, 4-6, 6-2, 6-1, suffering his first-ever US Open opening-round defeat
The shock loss ended Djokovic’s 25th Grand Slam bid and raised fresh questions about the 39-year-old’s future in tennis