Andrea Petkovic of Germany plays a shot in her match against Bethanie Mattek-Sands of the U.S. during the Brisbane International tennis tournament in Brisbane, Australia, Sunday, Dec. 29, 2013. (AP Photo/Tertius Pickard)

Australia Brisbane International Tennis

Andrea Petkovic of Germany plays a shot in her match against Bethanie Mattek-Sands of the U.S. during the Brisbane International tennis tournament in Brisbane, Australia, Sunday, Dec. 29, 2013. (AP Photo/Tertius Pickard)

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