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VIENNA, AUSTRIA - OCTOBER 24: Hyeon Chung of Korea during the round of 16 match between Hyeon Chung of Korea and Andrey Rublev of Russia on day four of the Erste Bank Open 500 at Wiener Stadthalle on October 24, 2019 in Vienna, Austria. (Photo by Andrea Kareth /SEPA.Media /Getty Images)

VIENNA, AUSTRIA - OCTOBER 24: Hyeon Chung of Korea during the round of 16 match between Hyeon Chung of Korea and Andrey Rublev of Russia on day four of the Erste Bank Open 500 at Wiener Stadthalle on October 24, 2019 in Vienna, Austria. (Photo by Andrea Kareth /SEPA.Media /Getty Images)