Novak Djokovic fell at the first hurdle as his tilt at a record-breaking 25th Grand Slam came to a shock end to Argentine Mariano Navone in a five-set epic at the US Open.

In his longest first round match in a major of Djokovic's career, the 39-year-old went down 7-6 (7-5) 5-7 4-6 6-2 6-1 to the world No 49.

More to follow...

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