A supporter of Switzerland"s Roger Federer watches his match against Russia's Nikolay Davydenko during their ATP World Tour Finals semifinal tennis match at the O2 Arena in London, Saturday Nov. 28, 2009. AP Photo logo AP Photo 27 months ago

A supporter of Switzerland"s Roger Federer watches his match against Russia's Nikolay Davydenko during their ATP World Tour Finals semifinal tennis match at the O2 Arena in London, Saturday Nov. 28, 2009.