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MADRID, SPAIN - NOVEMBER 22: Novak Djokovic of Serbia plays a forehand during his quarter final singles match against Karen Khachanov of Russia on Day Five of the 2019 Davis Cup at La Caja Magica on November 22, 2019 in Madrid, Spain. (Photo by Clive Brunskill/Getty Images)

MADRID, SPAIN - NOVEMBER 22: Novak Djokovic of Serbia plays a forehand during his quarter final singles match against Karen Khachanov of Russia on Day Five of the 2019 Davis Cup at La Caja Magica on November 22, 2019 in Madrid, Spain. (Photo by Clive Brunskill/Getty Images)
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