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MUNICH, GERMANY - MAY 05: Hyeon Chung of Korea plays a fore hand during the semifinal match against Alexander Zverev of Germany on day 8 of the BMW Open by FWU at MTTC IPHITOS on May 5, 2018 in Munich, Germany. (Photo by Alexander Hassenstein/Getty Images for BMW)

MUNICH, GERMANY - MAY 05:  Hyeon Chung of Korea  plays a fore hand during the semifinal match against Alexander Zverev of Germany on day 8 of the BMW Open by FWU at MTTC IPHITOS on May 5, 2018 in Munich, Germany.  (Photo by Alexander Hassenstein/Getty Images for BMW)