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MONTREAL, QC - AUGUST 13: Alexander Zverev (GER) winner of the tournament and Roger Federer (SUI) finalist after their final round match at ATP Coupe Rogers on August 13, 2017, at Uniprix Stadium in Montreal, QC (Photo by David Kirouac/Icon Sportswire via Getty Images)

MONTREAL, QC - AUGUST 13: Alexander Zverev (GER) winner of the tournament and Roger Federer (SUI) finalist after their final round match at ATP Coupe Rogers on August 13, 2017, at Uniprix Stadium in Montreal, QC (Photo by David Kirouac/Icon Sportswire via Getty Images)