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MELBOURNE, AUSTRALIA - JANUARY 26: Kei Nishikori of Japan plays a forehand in his fourth round match against David Ferrer of Spain during day eight of the 2015 Australian Open at Melbourne Park on January 26, 2015 in Melbourne, Australia. (Photo by Patrick Scala/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 26: Kei Nishikori of Japan plays a forehand in his fourth round match against David Ferrer of Spain during day eight of the 2015 Australian Open at Melbourne Park on January 26, 2015 in Melbourne, Australia. (Photo by Patrick Scala/Getty Images)
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