How much longer will Novak Djokovic put himself through the pain? Only he can know and only he can decide

As the clock ticked past midnight on day one of the US Open on Sunday, one thing was abundantly clear. Novak Djokovic did not want to think about, or discuss the future. Vomiting on several occasions and in more and more pain as the match drew on, Djokovic suffered physically and mentally in his 7-6 (5), 5-7, 4-6, 6-2, 6-1 defeat by Mariano Navone. It was his first opening-round defeat in any…

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