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SYDNEY, AUSTRALIA - JANUARY 07: Dimitar Kuzmanov of Bulgaria hits a volley during day five of the Group C doubles match at the 2020 ATP Cup Tennis at Ken Rosewall Arena on January 07, 2020 in Sydney, Australia. (Photo by Speed Media/Icon Sportswire via Getty Images)

SYDNEY, AUSTRALIA - JANUARY 07: Dimitar Kuzmanov of Bulgaria hits a volley during day five of the Group C doubles match at the 2020 ATP Cup Tennis at Ken Rosewall Arena on January 07, 2020 in Sydney, Australia. (Photo by Speed Media/Icon Sportswire via Getty Images)