Juan Martin del Potro has declined to play in Argentina's Davis Cup tie against Italy next year.
Rafa Nadal's growing domination of great rival Roger Federer continued with a comprehensive 7-5 6-3 victory.
Roger Federer slid his racket into his bag and walked off into the shadows of London's o2 Arena on Sunday as his leanest season since 2001 came to a rather
Roger Federer needed all his experience to beat Juan Martin Del Potro 6-4 6-7(2) 7-5 and progress at the World Tour Finals.
If Stanislas Wawrinka's life depended on the outcome of one tennis match he would surely want Rafa Nadal fighting his corner.
Rafael Nadal survived a poor second set to beat Tomas Berdych 6-4 1-6 6-3 at the ATP World Tour Finals at the O2 Arena.
Rafael Nadal dashed Tomas Berdych's hopes at the ATP World Tour Finals with a win over the Czech on Friday that put Swiss Stanislas Wawrinka into the semi
Novak Djokovic was pushed all the way by Juan Martin Del Potro at the ATP World Tour Finals in London.
ATP World Tour Finals
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