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SHANGHAI, CHINA - OCTOBER 14: Novak Djokovic of Serbia smashes his racquet in frustration during against Andy Murray of Great Britain during the final of the Shanghai Rolex Masters at the Qi Zhong Tennis Center on October 14, 2012 in Shanghai, China. (Photo by Lintao Zhang/Getty Images)

SHANGHAI, CHINA - OCTOBER 14:  Novak Djokovic of Serbia smashes his racquet in frustration during against Andy Murray of Great Britain during the final of the Shanghai Rolex Masters at the Qi Zhong Tennis Center on October 14, 2012 in Shanghai, China.  (Photo by Lintao Zhang/Getty Images)