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TOKYO, JAPAN - JULY 29: Kei Nishikori of Team Japan plays a forehand shot during his Men's Singles Quarterfinal match against Novak Djokovic of Team Serbia on day six of the Tokyo 2020 Olympic Games at Ariake Tennis Park on July 29, 2021 in Tokyo, Japan. (Photo by Quality Sport Images/Getty Images)

TOKYO, JAPAN - JULY 29: Kei Nishikori of Team Japan plays a forehand shot during his Men's Singles Quarterfinal match against Novak Djokovic of Team Serbia on day six of the Tokyo 2020 Olympic Games at Ariake Tennis Park on July 29, 2021 in Tokyo, Japan. (Photo by Quality Sport Images/Getty Images)