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MADRID, SPAIN - DECEMBER 01: Alexander Bublik of Kazakhstan serves during the Davis Cup Finals 2021 Quarter Final match between Serbia and Kazakhstan at Madrid Arena pabilion on December 01, 2021 in Madrid, Spain. (Photo By Oscar J. Barroso/Europa Press via Getty Images)

MADRID, SPAIN - DECEMBER 01: Alexander Bublik of Kazakhstan serves during the Davis Cup Finals 2021 Quarter Final match between Serbia and Kazakhstan at Madrid Arena pabilion on December 01, 2021 in Madrid, Spain. (Photo By Oscar J. Barroso/Europa Press via Getty Images)