A dominant performance from Novak Djokovic saw off Stanislas Wawrinka 6-3 6-3 to set up a final showdown with Rafael Nadal.
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.
Stanislas Wawrinka made the semi-finals of the ATP World Tour Finals with a 6-7(3) 6-4 6-1 win over David Ferrer.
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
Stanislas Wawrinka did what he had to do with victory over a weary David Ferrer at the ATP World Tour Finals on Friday and now needs a favour from Rafael Nadal.
He played the more inspiring tennis, yet it all ended in familiar fashion for Stanislas Wawrinka at the World Tour Finals.
Rafael Nadal will end with him on top of the world after a win over Stanislas Wawrinka at the ATP World Tour Finals.
Rafael Nadal ensured he will end the year as the world number one after beating Stanislas Wawrinka at the World Tour Finals.
ATP World Tour Finals
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