Roger Federer rallied to beat nemesis Andy Murray 3-6, 6-3, 6-1 Tuesday at the Barclay’s ATP World Tour Finals at the O2 Arena, clinching the year-end No. 1 ranking for the fifth time. Federer, who finished No. 2 behind Rafael Nadal in the 2008 year-end rankings, is the first player since Ivan Lendl in 1989 […]