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BUENOS AIRES, ARGENTINA - FEBRUARY 19: (L-R) Kei Nishikori of Japan and Alexandr Dolgopolov of Ukraine pose with the trophy after finish the final match between Kei Nishikori of Japan and Alexandr Dolgopolov of Ukraine as part of ATP Argentina Open at Buenos Aires Lawn Tennis Club on February 19, 2017 in Buenos Aires, Argentina. (Photo by Gabriel Rossi/LatinContent via Getty Images)

BUENOS AIRES, ARGENTINA - FEBRUARY 19: (L-R) Kei Nishikori of Japan and Alexandr Dolgopolov of Ukraine pose with the trophy after finish the final match between Kei Nishikori of Japan and Alexandr Dolgopolov of Ukraine as part of ATP Argentina Open at Buenos Aires Lawn Tennis Club on February 19, 2017 in Buenos Aires, Argentina. (Photo by Gabriel Rossi/LatinContent via Getty Images)