Serbia's Novak Djokovic waves to the spectators after winning the men's singles semifinal match against Florian Mayer in the China Open tennis tournament in Beijing Saturday, Oct. 6, 2012. Djokovic won 6-1, 6-4. (AP Photo/Andy Wong)

Associated Press
Serbia's Novak Djokovic waves to the spectators after winning the men's singles semifinal match against Florian Mayer in the China Open tennis tournament in Beijing Saturday, Oct. 6, 2012. Djokovic won 6-1, 6-4. (AP Photo/Andy Wong)
Serbia's Novak Djokovic waves to the spectators after winning the men's singles semifinal match against Florian Mayer in the China Open tennis tournament in Beijing Saturday, Oct. 6, 2012. Djokovic won 6-1, 6-4. (AP Photo/Andy Wong)
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