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MONTREAL, QC - AUGUST 13: General view of the match between Roger Federer of Switzerland and Alexander Zverev of Germany during day ten of the Rogers Cup presented by National Bank at Uniprix Stadium on August 13, 2017 in Montreal, Quebec, Canada. (Photo by Minas Panagiotakis/Getty Images)

MONTREAL, QC - AUGUST 13:  General view of the match between Roger Federer of Switzerland and Alexander Zverev of Germany during day ten of the Rogers Cup presented by National Bank at Uniprix Stadium on August 13, 2017 in Montreal, Quebec, Canada.  (Photo by Minas Panagiotakis/Getty Images)