Djokovic beats Federer to win ATP World Tour Finals

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Nadal, who endured his worst slump of his career by falling to 10th in singles rankings, climbed back to fifth after a string of success late in the year.

Serbia's Novak Djokovic celebrates with the trophy after winning the Barclays ATP World Tour Finals against Switzerland's Roger Federer yesterday.

Dutch-Romanian duo Jean-Julien Rojer and Horia Tecau earlier won the doubles title, beating Indian-Romanian pair Rohan Bopanna and Florin Mergea 6-4, 6-3 in the final.

Clear winners Federer was vulnerable on his second serve in the first set, winning only eight from 14, and could not cash in on two break points.

On top of that, there was a bust-up - Wawrinka taking umbrage at what he saw as inappropriate words from Federer's wife Mirka from the players' box at a key point in the third set.

Talking about the triumph, which capped off a sensational season for the Serbian, Djokovic said that this was the best year of his career so far and acknowledged the support of his team and his family.

The Swiss was all praise for the Serb and said: 'You don't win a break point, he does, or vice versa - it changes the whole outcome of the match.

With his nigh-on total dominance of hard court tournaments practically sealing the Australian and US Open titles before they've begun, and Wimbledon already conquered three times, injury would seem the only barrier to Djokovic conquering what many had assumed the impossible challenge of the modern era: the calendar Grand Slam.

Federer could ill-afford to be so generous and the world number three was scowling in frustration again in the sixth game when another sloppy forehand let Djokovic off the hook on break point.

At least he was able to take to the court, which was not the case past year when back problems forced him to withdraw ahead of the final, handing Djokovic the title.

This London night was dotted with a touch of the spectacular from the racquet of the 28-year old Serb, though at most times he was merely efficient.

Graphic showing titles won and lost by tennis world number Novak Djokovic in 2015.

Tomas Berdych, on having gone three years without playing Nishikori: "I think this is the tennis".

The 34 year old is nearly always knows what is going on, where the players are satisfied or un-satisfied. After the match, all Federer could do was tip his hat to the way Djokovic stood firm, absorbing every blow without flinching, as Federer went down swinging. Each player held serve comfortably until Federer served 3-4 and fell behind 0-40. This is the kind of domination that was Federer's hallmark in his best years.