Serbia's Novak Djokovic reacts during the singles tennis match against Japan's Yoshihito Nishioka at the Davis Cup Madrid Finals 2019 in Madrid on November 20, 2019. GABRIEL BOUYS
Tennis - Davis Cup Finals - Caja Magica, Madrid, Spain - November 20, 2019 Japan's Yoshihito Nishioka during his match against Serbia's Novak Djokovic Sergio Perez
Tennis - Davis Cup Finals - Caja Magica, Madrid, Spain - November 20, 2019 Japan's Yoshihito Nishioka in action during his match against Serbia's Novak Djokovic Sergio Perez
Tennis - Davis Cup Finals - Caja Magica, Madrid, Spain - November 20, 2019 Serbia's Novak Djokovic in action during his match against Japan's Yoshihito Nishioka Sergio Perez
Serbia's Novak Djokovic returns the ball to Japan's Yoshihito Nishioka during the singles tennis match between Serbia and Japan at the Davis Cup Madrid Finals 2019 in Madrid on November 20, 2019. GABRIEL BOUYS
Serbia's Novak Djokovic returns the ball to Japan's Yoshihito Nishioka during the singles tennis match between Serbia and Japan at the Davis Cup Madrid Finals 2019 in Madrid on November 20, 2019. GABRIEL BOUYS
MADRID, SPAIN - NOVEMBER 20: Novak Djokovic of Serbia looks on during his match played against Yoshihito Nishioka of Japan Day 3 of the 2019 Davis Cup at La Caja Magica on November 20, 2019 in Madrid, Spain. (Photo by Oscar J. Barroso / AFP7 / Europa Press Sports via Getty Images)
MADRID, SPAIN - NOVEMBER 20: Novak Djokovic of Serbia claps during his match played against Yoshihito Nishioka of Japan Day 3 of the 2019 Davis Cup at La Caja Magica on November 20, 2019 in Madrid, Spain. (Photo by Oscar J. Barroso / AFP7 / Europa Press Sports via Getty Images)