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HALLE, GERMANY - JUNE 17: Roger Federer (L) of Switzerland shakes hands with Ernests Gulbis of Latvia after winning the match during day three of the Gerry Weber Open at Gerry Weber Stadium on June 17, 2015 in Halle, Germany. (Photo by Thomas Starke/Bongarts/Getty Images)

HALLE, GERMANY - JUNE 17:  Roger Federer (L) of Switzerland shakes hands with Ernests Gulbis of Latvia after winning the match during day three of the Gerry Weber Open at Gerry Weber Stadium on June 17, 2015 in Halle, Germany.  (Photo by Thomas Starke/Bongarts/Getty Images)