Roger Federer of Switzerland reacts to his set win against Andy Murray of Britain during their ATP World Tour Finals singles semifinal tennis match at the O2 Arena in London, Sunday, Nov. 11, 2012. (AP Photo/Sang Tan)

Associated Press
Roger Federer of Switzerland reacts to his set win against Andy Murray of Britain during their ATP World Tour Finals singles semifinal tennis match at the O2 Arena in London, Sunday, Nov. 11, 2012. (AP Photo/Sang Tan)
Roger Federer of Switzerland reacts to his set win against Andy Murray of Britain during their ATP World Tour Finals singles semifinal tennis match at the O2 Arena in London, Sunday, Nov. 11, 2012. (AP Photo/Sang Tan)
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