Novak Djokovic qualifies for season-ending ATP World Tour Finals event in London . The Serbian will play Andy Murray on Sunday at the O2 Arena to decide who is next year's world number one and defending champion Roger Federer. Despite his imperious form the Serbian still claims Rafael Nadal is favorite for French Open . Djokovic can be crowned world number one if he reaches the final at Roland Garros .
Novak Djokovic qualifies for season-ending ATP World Tour Finals event in London . World number two has won 37 straight matches and seven titles in 2011 . Despite his imperious form the Serbian still claims Rafael Nadal is favorite for French Open . Djokovic can be crowned world number one if he reaches the final at Roland Garros .