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INNSBRUCK, AUSTRIA - NOVEMBER 27: Filip Krajinovic of Serbia plays a backhand shot during the Davis Cup match between Filip Krajinovic of Serbia and Dominik Koepfer of Germany at OlympiaWorld on November 27, 2021 in Innsbruck, Austria. (Photo by Adam Pretty/Getty Images)

INNSBRUCK, AUSTRIA - NOVEMBER 27: Filip Krajinovic of Serbia plays a backhand shot during the Davis Cup match between Filip Krajinovic of Serbia and Dominik Koepfer of Germany at OlympiaWorld on November 27, 2021 in Innsbruck, Austria. (Photo by Adam Pretty/Getty Images)