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MONTREAL, QC - AUGUST 08: Felix Auger-Aliassime of Canada hits a return against Karen Khachanov of Russia during day 7 of the Rogers Cup at IGA Stadium on August 8, 2019 in Montreal, Quebec, Canada. Karen Khachanov of Russia defeated Felix Auger-Aliassime of Canada 6-7, 7-5, 6-3. (Photo by Minas Panagiotakis/Getty Images)

MONTREAL, QC - AUGUST 08:  Felix Auger-Aliassime of Canada hits a return against Karen Khachanov of Russia during day 7 of the Rogers Cup at IGA Stadium on August 8, 2019 in Montreal, Quebec, Canada.  Karen Khachanov of Russia defeated Felix Auger-Aliassime of Canada 6-7, 7-5, 6-3.  (Photo by Minas Panagiotakis/Getty Images)