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MUNICH, GERMANY - MAY 02: Casper Ruud of Norway plays the ball at his first round match against Philipp Kohlschreiber of Germany during the 102. BMW Open by FWU at Iphitos tennis club on May 2, 2017 in Munich, Germany. (Photo by Alexander Hassenstein/Getty Images For BMW)

MUNICH, GERMANY - MAY 02:  Casper Ruud of Norway plays the ball at his first round match against Philipp Kohlschreiber of Germany during the 102. BMW Open by FWU at Iphitos tennis club on May 2, 2017 in Munich, Germany.  (Photo by Alexander Hassenstein/Getty Images For BMW)