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MELBOURNE, AUSTRALIA - JANUARY 21: Rafael Nadal of Spain celebrates winning his third round match against Alexander Zverev of Germany on day six of the 2017 Australian Open at Melbourne Park on January 21, 2017 in Melbourne, Australia. (Photo by Quinn Rooney/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 21:  Rafael Nadal of Spain celebrates winning his third round match against Alexander Zverev of Germany on day six of the 2017 Australian Open at Melbourne Park on January 21, 2017 in Melbourne, Australia.  (Photo by Quinn Rooney/Getty Images)