Serbia's Novak Djokovic, front, performs South Korean rapper PSY's " Gangnam Style" dance with volunteers while Jo-Wilfried Tsonga of France, second from left, looks on after a prize presentation for their men's singles final match of the China Open tennis tournament in Beijing Sunday, Oct. 7, 2012. Djokovic won the China Open tennis tournament, defeated Tsonga 7-6, 6-2. (AP Photo/Andy Wong)

Associated Press
Serbia's Novak Djokovic, front, performs South Korean rapper PSY's " Gangnam Style" dance with volunteers while Jo-Wilfried Tsonga of France, second from left, looks on after a prize presentation for their men's singles final match of the China Open tennis tournament in Beijing Sunday, Oct. 7, 2012. Djokovic won the China Open tennis tournament, defeated Tsonga 7-6, 6-2. (AP Photo/Andy Wong)
Serbia's Novak Djokovic, front, performs South Korean rapper PSY's " Gangnam Style" dance with volunteers while Jo-Wilfried Tsonga of France, second from left, looks on after a prize presentation for their men's singles final match of the China Open tennis tournament in Beijing Sunday, Oct. 7, 2012. Djokovic won the China Open tennis tournament, defeated Tsonga 7-6, 6-2. (AP Photo/Andy Wong)
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