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MELBOURNE, VIC - JANUARY 22: Andy Murray of the United Kingdom returns the ball during the fourth round of the 2017 Australian Open on January 22, 2017, at Melbourne Park Tennis Centre in Melbourne, Australia.(Photo by Jason Heidrich/Icon Sportswire via Getty Images)

MELBOURNE, VIC - JANUARY 22: Andy Murray of the United Kingdom returns the ball during the fourth round of the 2017 Australian Open on January 22, 2017, at Melbourne Park Tennis Centre in Melbourne, Australia.(Photo by Jason Heidrich/Icon Sportswire via Getty Images)