Tennis - Barclays ATP World Tour Finals - O2 Arena, London - 21/11/15 Men's Singles - Switzerland's Roger Federer in action during his semi final match with Switzerland's Stanislas Wawrinka Action Images via Reuters / Tony O'Brien Livepic
LONDON (Reuters) - Beating Novak Djokovic has been beyond virtually every player this year but Roger Federer has the chance to get the better of the Serb for the second time in a week on Sunday.
The 34-year-old ended Djokovic's 23-match winning streak on Tuesday with a classy straight-sets victory in the group stage of the ATP World Tour Finals but knows he will need to be at least as good to repeat that feat in the final.
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