Ailing Novak Djokovic falls in US Open first round for earliest grand slam exit in 20 years

Mariano Navone wins 7-6 (7-5), 5-7, 4-6, 6-2, 6-1 to end Serb’s hopesDjokovic vomits numerous times and has to fight off crampsThe first night session of the US Open this year was approaching the three-hour mark when Novak Djokovic walked briskly to the corner of the vast Arthur Ashe Stadium court…