Roger Federer of Switzerland returns the ball against his compatriot Stanislas Wawrinka during the third round match of the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Thursday, Oct. 11, 2012. Federer won 4-6 7-6(4), 6-0. (AP Photo/Eugene Hoshiko)

Associated Press
Roger Federer of Switzerland returns the ball against his compatriot Stanislas Wawrinka during the third round match of the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Thursday, Oct. 11, 2012. Federer won 4-6 7-6(4), 6-0. (AP Photo/Eugene Hoshiko)
Roger Federer of Switzerland returns the ball against his compatriot Stanislas Wawrinka during the third round match of the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Thursday, Oct. 11, 2012. Federer won 4-6 7-6(4), 6-0. (AP Photo/Eugene Hoshiko)
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