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BRISBANE, AUSTRALIA - JANUARY 07: Ana Ivanovic of Serbia celebrates winning a point in her match against Jarmila Gajdosova of Australia during day four of the 2015 Brisbane International at Pat Rafter Arena on January 7, 2015 in Brisbane, Australia. (Photo by Chris Hyde/Getty Images)

BRISBANE, AUSTRALIA - JANUARY 07:  Ana Ivanovic of Serbia celebrates winning a point in her match against Jarmila Gajdosova of Australia during day four of the 2015 Brisbane International at Pat Rafter Arena on January 7, 2015 in Brisbane, Australia.  (Photo by Chris Hyde/Getty Images)