Back in Australia, Federer back in quarterfinals

Rafael Nadal of Spain celebrates after defeating Kei Nishikori of Japan  during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Eugene Hoshiko)

Rafael Nadal of Spain celebrates after defeating Kei Nishikori of Japan during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Eugene Hoshiko)

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