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DUESSELDORF, GERMANY - MARCH 06: (BILD ZEITUNG OUT) Jan-Lennard Struff of Germany controls the ball during the first day of the Davis Cup qualifier between Germany and Belarus at Castello on March 6, 2020 in Duesseldorf, Germany. (Photo by Alex Gottschalk/DeFodi Images via Getty Images)

DUESSELDORF, GERMANY - MARCH 06: (BILD ZEITUNG OUT) Jan-Lennard Struff of Germany controls the ball during the first day of the Davis Cup qualifier between Germany and Belarus at Castello on March 6, 2020 in Duesseldorf, Germany. (Photo by Alex Gottschalk/DeFodi Images via Getty Images)