Although not always at their best, the top two men outclassed quality semifinal opponents and bring plenty of momentum to Monday.
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A 39th meeting between the top two men in the world offers a stirring conclusion to the 2013 season.
A thrilling victory over Juan Martin Del Potro revealed plenty of vintage moments from the Swiss star.
Rafael Nadal and Roger Federer renew their rivalry, while Novak Djokovic seeks to extend his dominance over Stanislas Wawrinka.
In his World Tour Finals debut, the Swiss star has confirmed his 2013 breakthrough by rising to the occasion against elite foes.
The last day of round-robin action in London features a winner-take-all encounter between Roger Federer and Juan Martin Del Potro.
Rotating the event among all surfaces would deny elite players a chance to showcase their indoor skills on a grand stage.
Round-robin play in Group A concludes with matches pitting Stanislas Wawrinka against David Ferrer and Rafael Nadal against Tomas Berdych.
The only man in the top 10 who has not won a title this year eyes one last chance in London.
Group B returns to the spotlight with matches pitting Roger Federer against Richard Gasquet and Novak Djokovic against Juan Martin Del Potro.
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