MELBOURNE, AUSTRALIA - JANUARY 15: Kei Nishikori of Japan hits a forehand during a practice session ahead of the 2016 Australian Open at Melbourne Park on January 15, 2016 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)
MELBOURNE, AUSTRALIA - JANUARY 15: Kei Nishikori of Japan hits a forehand during a practice session ahead of the 2016 Australian Open at Melbourne Park on January 15, 2016 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)