Roger Federer returns during his victory over David Ferrer during their group B singles match in the round robin stage on the fourth day of the ATP World Tour Finals at the O2 Arena in London on ... more 

Roger Federer returns during his victory over David Ferrer during their group B singles match in the round robin stage on the fourth day of the ATP World Tour Finals at the O2 Arena in London on November 8 2012 (AFP) less