The Australian Open

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Roger Federer of Switzerland makes a backhand return to James Duckworth of Australia during their first round match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014.(AP Photo/Eugene Hoshiko)

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Roger Federer of Switzerland makes a backhand return to James Duckworth of Australia during their first round match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014.(AP Photo/Eugene Hoshiko)

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Supporters of Kei Nishikori of Japan cheer hymn on during 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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Kei Nishikori of Japan makes a forehand return to Marinko Matosevic of Australia 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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Kei Nishikori of Japan wraps an ice pack around his head during a break in 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)