Milos Raonic is ready for the ‘difficult task’ of trying to defeat four-time defending champion Novak Djokovic at the ATP World Tour Championship in London. The big-serving Raonic opened his campaign at the O2 Arena with a comprehensive 6-3 6-4 win over Gael Monfils and now moves on to face Djokovic, who was pushed hard before overcoming Dominic Thiem 6-7 6-0 6-2.