Japan's Kei Nishikori reacts during his fourth round match against Spain's David Ferrer at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP Photo/Dita Alangkara)

Associated Press
Japan's Kei Nishikori reacts during his fourth round match against Spain's David Ferrer at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP Photo/Dita Alangkara)
Japan's Kei Nishikori reacts during his fourth round match against Spain's David Ferrer at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP Photo/Dita Alangkara)
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