Hello and welcome to LIVE game-by-game coverage of the last match in Group Stan Smith at this year's ATP World Tour finals. World number one Novak Djokovic faces Tomas Berdych knowing he will qualify for the semi finals if he wins just one set here tonight. The Birdman has a dreadful head-to-head record against the Serbian and would usually take any kind of victory - but he needs to sink Novak in straight sets if he is to join Roger Federer in the last four.