Novak Djokovic was visibly upset during the final set in his US Open first round defeat to Mariano Navone.
Related stories
Arteta agrees new Arsenal contract
Serie A Power Rankings: Roma nipping at Inter's heels after draw; AC Milan back in the top three
Dual Champion Hurdle winner Hurricane Fly dies aged 22
Three mock trades the Steelers could make to deal disgruntled CB Joey Porter Jr.
DraftKings Sees Strong NFL Start, Prediction Markets Surge as $1B EBITDA Target Holds
Inside the numbers on Florida RB Jadan Baugh's scorching start to the season