Kei Nishikori of Japan walks onto Show Court 2 for his first round match against Marinko Matosevic of Australia at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014.(AP Photo/Aaron Favila)

Australian Open Tennis

Kei Nishikori of Japan walks onto Show Court 2 for his first round match against Marinko Matosevic of Australia at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014.(AP Photo/Aaron Favila)

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