Despite having a superb year on the ATP World Tour, Roger Federer ends it with another defeat to Novak Djokovic. Federer beat the runaway world No 1 three times in 2015 but lost in the finals of Wimbledon, the US Open and now the Barclays ATP World Tour Finals. Despite Djokovic being the man to beat in 2016, Federer will not be basing his off-season training on finding ways to beat the Serb.