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VIENNA, AUSTRIA - OCTOBER 22: Hyeon Chung of Korea during the round of 32 match between Chung Hyeon and Milos Raonic on day two of the Erste Bank Open at Wiener Stadthalle on October 22, 2019 in Vienna, Austria. (Photo by Josef Bollwein/SEPA.Media /Getty Images)

VIENNA, AUSTRIA - OCTOBER 22: Hyeon Chung of Korea during the round of 32 match between Chung Hyeon and Milos Raonic on day two of the Erste Bank Open at Wiener Stadthalle on October 22, 2019 in Vienna, Austria. (Photo by Josef Bollwein/SEPA.Media /Getty Images)