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COLOGNE, GERMANY - OCTOBER 23: Diego Schwartzman of Argentina serves during the match between Alejandro Davidovich Fokina of Spain and Diego Schwartzman of Argentina of day five of the Bett1Hulks Championship Tennis Tournament at Lanxess Arena on October 23, 2020 in Cologne, Germany. (Photo by Christof Koepsel/Getty Images)

COLOGNE, GERMANY - OCTOBER 23: Diego Schwartzman of Argentina serves during the match between Alejandro Davidovich Fokina of Spain and Diego Schwartzman of Argentina of day five of the Bett1Hulks Championship Tennis Tournament at Lanxess Arena on October 23, 2020 in Cologne, Germany. (Photo by Christof Koepsel/Getty Images)