Li Na of China celebrates after defeating Flavia Pennetta of Italy during their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014.(AP Photo/Aaron Favila)

Australian Open Tennis

Li Na of China celebrates after defeating Flavia Pennetta of Italy during their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014.(AP Photo/Aaron Favila)

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