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US Open: Defending champ has health issue

This is the 3rd straight year that the US Open defending champ had injury issue in Men’ Singles. Stan Wawrinka missed US Open due to knee injury that ended his season in 2017. In 2018 Rafael Nadal retired in the semifinal vs Juan Martin Del Potro. This year, Novak Djokovic retired due to shoulder injury vs Stan Wawrinka in R16.