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TOKYO, JAPAN - JULY 25: Yoshihito Nishioka of Team Japan plays a backhand during his Men's Singles First Round match against Karen Khachanov of Team ROC on day two of the Tokyo 2020 Olympic Games at Ariake Tennis Park on July 25, 2021 in Tokyo, Japan. (Photo by Patrick Smith/Getty Images)

TOKYO, JAPAN - JULY 25: Yoshihito Nishioka of Team Japan plays a backhand during his Men's Singles First Round match against Karen Khachanov of Team ROC on day two of the Tokyo 2020 Olympic Games at Ariake Tennis Park on July 25, 2021 in Tokyo, Japan. (Photo by Patrick Smith/Getty Images)