Serbia's Novak Djokovic reacts after winning a set point against Florian Mayer 

Serbia's Novak Djokovic reacts after winning a set point against Florian Mayer during their men's singles semifinal match in the China Open tennis tournament in Beijing Saturday, Oct. 6, 2012. Djokovic defeated Mayer 6-1, 6-4. (AP Photo/Andy Wong)
Associated Press
Serbia's Novak Djokovic reacts after winning a set point against Florian Mayer during their men's singles semifinal match in the China Open tennis tournament in Beijing Saturday, Oct. 6, 2012. Djokovic defeated Mayer 6-1, 6-4. (AP Photo/Andy Wong)
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