Reaction after Novak Djokovic beat Roger Federer 6-3, 6-4 in London on Sunday (22nd November) to win the ATP World Tour Finals title for a record fourth successive year.

SOUNDBITE: (English) Novak Djokovic, ATP World Tour Finals champion:

"Every big achievement means the world to me. I mean, obviously I'm working hard to get myself in a position to fight for the biggest trophies. I'm so blessed, though. Honestly to have the year that I had, it's incredible. I cannot say I expected it. You know, I always ask a lot from myself and I always hope to make the best results possible but this season has been almost flawless. You know, I didn't lose too many matches and won three out of four Grand Slams and, you know, six Masters Series, and now I've finished the season in the best possible way. So as I said, I'm very proud of it, and now it's time to leave the racquet aside for a little bit and enjoy it."

SOUNDBITE: (English) Novak Djokovic, ATP World Tour Finals champion:

(On suggestion that Djokovic's year will go down as one of the greatest in the history of tennis.)

"I mean, I would lie if I would say that I don't care too much about it. Of course, I mean of course I care. Of course it's an extreme privilege to be mentioned as somebody that is part of this elite group of players that make history of our sport. And I'm very grateful to be able to compete at this level.."

SOUNDBITE: (English) Roger Federer, ATP World Tour Finals runner-up:

(On the match.)

"It would have been nice to serve a little bit better early on in the match and play better overall on his second serve, because he does allow you to play on his second serve. And maybe at times I went for too much and I had the moments where I should have gone safe, you know I didn't, and vice versa. So those are the two regrets I have that if I play the match again I would do different, or I would have tried to do different. Other than that, I thought it was a good match - it was close."