The defending champion and World No.1Novak Djokovich takes on World No.5 David Ferrer in Abu Dhabi ATP World Tennis Championship semi final today.Djokovich is the favorite having won the last edition of the tournament defeating David Ferrer in straight sets. In the opening match yesterday, the US Open Champion Andy Murray lost out to Janko Tipsarevich 3-6,4-6 in straight sets. In another match, Spaniard David Ferrer overpowered Thomas Berdych 6-2,6-4 in straight sets. Six top leading players are participating in the last major tennis tournament of the cal ender year 2012.