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Rafael Nadal (ESP) in action against Jack Sock (USA) during the ATP World Tour Masters 1000 Internazionali BNL D'Italia at the Foro Italico, Rome, Italy on 18 May 2017. (Photo by Giuseppe Maffia/NurPhoto via Getty Images)

Rafael Nadal (ESP) in action against Jack Sock (USA) during the ATP World Tour Masters 1000 Internazionali BNL D'Italia at the Foro Italico, Rome, Italy on 18 May 2017.  (Photo by Giuseppe Maffia/NurPhoto via Getty Images)