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ROME, ITALY - MAY 16: Jan-Lennard Struff of Germany celebrates against Kei Nishikori of Japan in their Men's Singles Round of 16 match during Day Five of the International BNL d'Italia at Foro Italico on May 16, 2019 in Rome, Italy. (Photo by Adam Pretty/Getty Images)

ROME, ITALY - MAY 16: Jan-Lennard Struff of Germany celebrates against Kei Nishikori of Japan in their Men's Singles Round of 16 match during Day Five of the International BNL d'Italia at Foro Italico on May 16, 2019 in Rome, Italy. (Photo by Adam Pretty/Getty Images)