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ROME, ITALY - MAY 17: Kei Nishikori of Japan plays a forehand against Diego Schwartzman of Argentina in their Men's singles quarter final match during Day six of the International BNL d'Italia at Foro Italico on May 17, 2019 in Rome, Italy. (Photo by Paolo Bruno/Getty Images)

ROME, ITALY - MAY 17:  Kei Nishikori of Japan plays a forehand against Diego Schwartzman of Argentina in their Men's singles quarter final match during Day six of the International BNL d'Italia at Foro Italico on May 17, 2019 in Rome, Italy.  (Photo by Paolo Bruno/Getty Images)