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Roger Federer Rafael Nadal

There is hardly anything Roger Federer has not achieved in tennis over the past decade but the Swiss admits seizing back the world number one ranking from Rafael Nadal may stretch even his mercurial powers.

Elite8 selfie at ATP World tour finals : Andy Murray ,Novak Djokovic, Stan Wawrinka, Milos Raonic, Kei Nishikori , Gael Monfils, Marin Cilic and Dominic Thiem

The Top 8 Players of the 2016 season at the ATP World Tour Finals Launch in London on Thursday