Alison Riske of the U.S. hits a backhand return to Angelique Kerber of Germany during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014.(AP Photo/Rick Rycroft)

Australian Open Tennis

Alison Riske of the U.S. hits a backhand return to Angelique Kerber of Germany during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014.(AP Photo/Rick Rycroft)

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