Novak Djokovic made his earliest exit at the U.S. Open after a shock 7-6(5) 5-7 4-6 6-2 6-1 loss to unseeded Argentine Mariano Navone in a gruelling first-round clash on Sunday, as his latest bid for a record 25th Grand Slam title went up in smoke.
The 39-year-old, who vomited during the match and struggled to serve towards the end due to a back issue, was in tears shortly before
