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MELBOURNE, AUSTRALIA - JANUARY 14:  Caroline Wozniacki of Denmark hits a backhand volley during a practice session ahead of the 2018 Australian Open at Melbourne Park on January 14, 2018 in Melbourne, Australia.  (Photo by Michael Dodge/Getty Images)
MELBOURNE, AUSTRALIA - JANUARY 14:  Caroline Wozniacki of Denmark hits a backhand volley during a practice session ahead of the 2018 Australian Open at Melbourne Park on January 14, 2018 in Melbourne, Australia.  (Photo by Michael Dodge/Getty Images)

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