(130121) -- MELBOURNE , Jan. 21, 2013 (Xinhua) -- Novak Djokovic of Serbia celebrates during his fourth round men's singles match against Stanislas Wawrinka of Switzerland on the seventh day of 2013 Australian Open tennis tournament in Melbourne, Australia, Jan. 20, 2013. Novak Djokovic won 3-2. (Xinhua/Bai Xue) (ql)
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