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MELBOURNE, AUSTRALIA - JANUARY 16: Milos Raonic of Canada plays a backhand in his first round match against Lukas Lacko of Slovakia on day two of the 2018 Australian Open at Melbourne Park on January 16, 2018 in Melbourne, Australia. (Photo by Cameron Spencer/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 16:  Milos Raonic of Canada plays a backhand in his first round match against Lukas Lacko of Slovakia on day two of the 2018 Australian Open at Melbourne Park on January 16, 2018 in Melbourne, Australia.  (Photo by Cameron Spencer/Getty Images)