Roger Federer of Switzerland signs autograph on a camera after the quarterfinal match against Juan Martin Del Potro of Argentina at the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) 
Roger Federer of Switzerland returns the ball to Juan Martin Del Potro of Argentina during the quarterfinal match of the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) 
Roger Federer of Switzerland returns the ball to Juan Martin Del Potro of Argentina during the quarterfinal match of the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) 
Roger Federer of Switzerland greets the audience after the quarterfinal match against Juan Martin Del Potro of Argentina at the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) 
Roger Federer of Switzerland returns the ball to Juan Martin Del Potro of Argentina during the quarterfinal match of the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) 
Juan Martin Del Potro of Argentina returns the ball to Roger Federer of Switzerland during the quarterfinal match of the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) 
Roger Federer of Switzerland returns the ball to Juan Martin Del Potro of Argentina during the quarterfinal match of the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) 
Juan Martin Del Potro of Argentina returns the ball to Roger Federer of Switzerland during the quarterfinal match of the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) 
Roger Federer of Switzerland returns the ball to Juan Martin Del Potro of Argentina during the quarterfinal match of the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) 
Roger Federer of Switzerland serves to Juan Martin Del Potro of Argentina during the quarterfinal match of the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) 
Roger Federer of Switzerland returns the ball to Juan Martin Del Potro of Argentina during the quarterfinal match of the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) 
Roger Federer of Switzerland returns the ball to Juan Martin Del Potro of Argentina during the quarterfinal match of the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) 
Roger Federer of Switzerland signs autograph on a camera after the quarterfinal match against Juan Martin Del Potro of Argentina at the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) 
Juan Martin Del Potro of Argentina returns the ball to Roger Federer of Switzerland during the quarterfinal match of the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) 
Roger Federer of Switzerland changes his racket during the quarterfinal match against Juan Martin Del Potro of Argentina at the BNP Paribas 2013 Masters Tennis tournament in Paris, France, on Nov. 1, 2013. Federer won 2-1. (Xinhua/Chen Xiaowei) |
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