Novak Djokovic of Serbia returns a shot to Tommy Haas of Germany during the men's singles Quarterfinals match at the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Friday Oct. 12, 2012. Djokovic won 6-3, 6-3. (AP Photo/Kin Cheung)

Associated Press
Novak Djokovic of Serbia returns a shot to Tommy Haas of Germany during the men's singles Quarterfinals match at the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Friday Oct. 12, 2012. Djokovic won 6-3, 6-3. (AP Photo/Kin Cheung)
Novak Djokovic of Serbia returns a shot to Tommy Haas of Germany during the men's singles Quarterfinals match at the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Friday Oct. 12, 2012. Djokovic won 6-3, 6-3. (AP Photo/Kin Cheung)
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