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MELBOURNE, AUSTRALIA - JANUARY 20: Gilles Muller of Luxembourg celebrates a point in his first round match against Pablo Carreno Busta of Spain during day two of the 2015 Australian Open at Melbourne Park on January 20, 2015 in Melbourne, Australia. (Photo by Ryan Pierse/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 20:  Gilles Muller of Luxembourg celebrates a point in his first round match against Pablo Carreno Busta of Spain during day two of the 2015 Australian Open at Melbourne Park on January 20, 2015 in Melbourne, Australia.  (Photo by Ryan Pierse/Getty Images)