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TOKYO, JAPAN - JULY 24: Hugo Dellien of Team Bolivia plays a backhand during his Men's Singles First Round match against Novak Djokovic of Team Serbia on day one of the Tokyo 2020 Olympic Games at Ariake Tennis Park on July 24, 2021 in Tokyo, Japan. (Photo by Clive Brunskill/Getty Images)

TOKYO, JAPAN - JULY 24: Hugo Dellien of Team Bolivia plays a backhand during his Men's Singles First Round match against Novak Djokovic of Team Serbia on day one of the Tokyo 2020 Olympic Games at Ariake Tennis Park on July 24, 2021 in Tokyo, Japan. (Photo by Clive Brunskill/Getty Images)