Marinko Matosevic of Australia makes a backhand return to Kei Nishikori of Japan during their first round match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014.(AP Photo/Aaron Favila)

Australian Open Tennis

Marinko Matosevic of Australia makes a backhand return to Kei Nishikori of Japan during their first round match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014.(AP Photo/Aaron Favila)

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