Novak Djokovic says he always sees himself as the best player in the world, regardless of ranking. Djokovic brought the curtain down on a sensational season as he beat Casper Ruud to win the ATP Finals in Turin. It was a record-equalling sixth time he had won the tournament, and saw him finish they year ranked number five in the world. That is a remarkable achievement given he has been unable to contest two Grand Slams and wasn’t awarded ranking points for the one he won. He, though, really underlined his authorit …