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HALLE, GERMANY - JUNE 19: Florian Mayer of Germany plays a backhand in the final match of the Gerry Weber Open against Alexander Zverev of Germany at Gerry Weber Stadium on June 19, 2016 in Halle, Germany. (Photo by Thomas Starke/Bongarts/Getty Images)

HALLE, GERMANY - JUNE 19:  Florian Mayer of Germany plays a backhand in the final match of the Gerry Weber Open against Alexander Zverev of Germany at Gerry Weber Stadium on June 19, 2016 in Halle, Germany.  (Photo by Thomas Starke/Bongarts/Getty Images)