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Kwon Soon-woo of South Korea hits a return in his match against Marin Cilic of Croatia at the Kooyong Classic tennis tournament in Melbourne on January 15, 2020. (Photo by William WEST / AFP) / --IMAGE RESTRICTED TO EDITORIAL USE - NO COMMERCIAL USE-- (Photo by WILLIAM WEST/AFP via Getty Images)

Kwon Soon-woo of South Korea hits a return in his match against Marin Cilic of Croatia at the Kooyong Classic tennis tournament in Melbourne on January 15, 2020. (Photo by William WEST / AFP) / --IMAGE RESTRICTED TO EDITORIAL USE - NO COMMERCIAL USE-- (Photo by WILLIAM WEST/AFP via Getty Images)