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PERTH, AUSTRALIA - JANUARY 09: Heather Watson and Andy Murray of Great Britain celebrate a point in the mixed doubles against Casey Dellacqua and Marinko Matosevic of Australia during day six of the 2015 Hopman Cup at Perth Arena on January 9, 2015 in Perth, Australia. (Photo by Paul Kane/Getty Images)

PERTH, AUSTRALIA - JANUARY 09:  Heather Watson and Andy Murray of Great Britain celebrate a point in the mixed doubles against Casey Dellacqua and Marinko Matosevic of Australia during day six of the 2015 Hopman Cup at Perth Arena on January 9, 2015 in Perth, Australia.  (Photo by Paul Kane/Getty Images)