In the ATP World Tour Finals, the elite season-ender witnessed Japan's Kei Nishikori defeating Briton Andy Murray in a group match. World number five Nishikori found his range as he registered a 6-4 6-4 victory over twice grand slam champion Murray in the O2 Arena, London last night. In the second game, Swiss Roger Fedrer defeated Milos Ranoic of Canada 6-1, 7-6.In today's encounter world number one Novak Djokovic will start his campaign against lower ranked Marin Cilic of Croatia. In the other game world number four, Stanislas Wawrinka will take on seventh ranked, Tomas Berdych from Czech. This is a round robin tournament and it will determine the end of the year ranking of top players.