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HANOVER, GERMANY - MARCH 06: Lukas Rosol of Czech Republic plays a forehand in his match against Alexander Zverev of Germany during Day 3 of the Davis Cup World Group first round between Germany and Czech Republic on March 6, 2016 in Hanover, Germany. (Photo by Oliver Hardt/Bongarts/Getty Images)

HANOVER, GERMANY - MARCH 06:  Lukas Rosol of Czech Republic  plays a forehand in his match against Alexander Zverev of Germany during Day 3 of the Davis Cup World Group first round between Germany and Czech Republic on March 6, 2016 in Hanover, Germany.  (Photo by Oliver Hardt/Bongarts/Getty Images)