The defending champion Novak Djokovic set up a title showdown against Rafael Nadal at the ATP World Tour Finals with a straight sets win over Switzerland's Stanislas Wawrinka.
The Serb, who lost his number one ranking to Nadal in October, beat Wawrinka 6-3 6-3 in the second semi-final.
In the first semi-final Nadal beat Wawrinka's fellow Swiss Roger Federer 7-5 6-3.
