Kei Nishikori of Japan speaks during a press conference after his fourth round loss to Rafael Nadal of Spain during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014. (AP Photo/Shuji Kajiyama)

Australian Open Tennis

Kei Nishikori of Japan speaks during a press conference after his fourth round loss to Rafael Nadal of Spain during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014. (AP Photo/Shuji Kajiyama)

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