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MUNICH, GERMANY - MAY 06: Guido Pella of Argentina celebrates victory after winning his semi finale match against Hyeon Chung of Korea of the 102. BMW Open by FWU at Iphitos tennis club on May 6, 2017 in Munich, Germany. (Photo by Alexander Hassenstein/Getty Images For BMW)

MUNICH, GERMANY - MAY 06:  Guido Pella of Argentina celebrates victory after winning his  semi finale match against Hyeon Chung of Korea of the 102. BMW Open by FWU at Iphitos tennis club on May 6, 2017 in Munich, Germany.  (Photo by Alexander Hassenstein/Getty Images For BMW)