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MONTREAL, ON - AUGUST 12: Nick Kyrgios of Australia looks on as he bites onto his chain against Stan Wawrinka of Switzerland during day three of the Rogers Cup at Uniprix Stadium on August 12, 2015 in Montreal, Quebec, Canada. (Photo by Minas Panagiotakis/Getty Images)

MONTREAL, ON - AUGUST 12:  Nick Kyrgios of Australia looks on as he bites onto his chain against Stan Wawrinka of Switzerland during day three of the Rogers Cup at Uniprix Stadium on August 12, 2015 in Montreal, Quebec, Canada.  (Photo by Minas Panagiotakis/Getty Images)