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ROME, ITALY - MAY 20: Juan Martin Del Potro of Argentina in action during the men's quarter-final match against Novak Djokovic of Serbia on Day Seven of the Internazionali BNL d'Italia 2017 at Foro Italico on May 20, 2017 in Rome, Italy. (Photo by Michael Steele/Getty Images)

ROME, ITALY - MAY 20: Juan Martin Del Potro of Argentina in action during the men's quarter-final match against  Novak Djokovic of Serbia on Day Seven of the Internazionali BNL d'Italia 2017 at Foro Italico on May 20, 2017 in Rome, Italy.  (Photo by Michael Steele/Getty Images)