Three - time defending champion Novak Djokovic reaches the final . He beat fellow Serb Janko Tipsarevic to avoid ATP World Tour Finals defeat . Djokovic to beat Andy Murray in repeat of their Australian Open epic . Djokovic saved a set point in the second-set tiebreaker before beating Tipsarevic 6-1 7-6 , while Murray saw off the fifth seed Tomas Berdych 6-3 7-5 . Four - time champion Roger Federer also through to last 16 .
Three - time defending champion Novak Djokovic reaches the final . He beat fellow Serb Janko Tipsarevic to avoid ATP World Tour Finals defeat . Djokovic to beat Andy Murray in repeat of their Australian Open epic . Four - time champion Roger Federer also through to last 16 .