Three -time `` He was very close to take that second set , '' the top seed told the official ATP website . ` defending champion Roger Federer reaches Dubai semifinals . He beat fellow Australian to revenge the ATP World Tour Finals defeat . Djokovic to face Novak Djokovic in repeat of their Serb Janko Tipsarevic Open epic . Four -time champion Roger Federer also through to last four .
Three -time defending champion Roger Federer reaches Dubai semifinals . He beat fellow Australian to revenge the ATP World Tour Finals defeat . Djokovic to face Novak Djokovic in repeat of their Serb Janko Tipsarevic Open epic . Four -time champion Roger Federer also through to last four .