Murray, Federer Headline Day 1 In London

The Barclays ATP World Tour Finals return to The O2 in London for the sixth straight year. The eight-man field is led by world No. 1 Novak Djokovic and No. 2 Roger Federer, who have won nine of the last 11 season-ending titles between them. The duo are joined by Stan Wawrinka, Tomas Berdych, Andy Murray and first-time qualifiers Kei Nishikori, Marin Cilic and Milos Raonic.