Federer survives London battle
Updated | By Staff Writer
Roger Federer and Novak Djokovic will do battle for the title at the ATP World Tour Finals.

Federer saved four match points in beating Stanislas Wawrinka in a tight semi-final last night.
Federer eventually defeated the Australian Open champion 4-6 7-5 7-6 in London.
Djokovic also needed three sets to outs Kei Nishikori in the other semi-final.
The Serb won 6-1 3-6 6-0.
Federer has beaten Djokovic 19 times in 36 meetings and has won this tournament on six occasions.
(File Photo: Gallo Images)
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