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. ... more 

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) less