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Novak Djokovic: Won the ATP World Tour Finals last year
The defending champion has been given the tag of favourite after a good run of form over the latter part of the season.
Djokovic clinched his second year-end title last year, overcoming Roger Federer in two tightly-contested sets at the O2 Arena.
The Serbian started the year in fine style and is finishing it strongly, but in between was powerless to prevent Rafael Nadal from usurping him as the No 1 ranked player in the world.
A third straight title at the Australian Open and a victory over Nadal in the final of the Monte Carlo Masters were followed by defeats in the semi-final of the French Open and final of Wimbledon.
The North American hard-court swing ended with defeat in the final of the US Open to Nadal, a match in which he fought hard but was ultimately outplayed quite comfortably.
It seemed that both Andy Murray and Nadal had his number, but the former will not be present in London and he got his revenge on the latter by beating him in the final in China.
He won the Shanghai Masters last time out and looks to be in good form heading into London, where his scrambling, spectacular defence and brilliant backhand are sure to impress again.
|17/11/13||T Berdych||Davis Cup World Group Final||Match 4||Won||4-6, 6-75, 2-6|
|15/11/13||R Stepanek||Davis Cup World Group Final||Match 1||Won||5-7, 1-6, 4-6|
|11/11/13||R Nadal||Barclays ATP World Tour Finals||F||Won||6-3, 6-4|
|10/11/13||S Wawrinka||Barclays ATP World Tour Finals||SF||Won||3-6, 3-6|
|09/11/13||R Gasquet||Barclays ATP World Tour Finals||Grp B||Won||6-75, 6-4, 3-6|
|07/11/13||J Del Potro||Barclays ATP World Tour Finals||Grp B||Won||3-6, 6-3, 3-6|
Defending champion Novak Djokovic takes on Stanislas Wawrinka for a place in the Barclays ATP World Tour Final.
Novak Djokovic made it 19 wins in a row as he beat Juan Martin Del Potro to make the last four of the World Tour Finals.
Novak Djokovic has slammed tennis' anti-doping programme claiming he no longer has any trust in the system.
Annabel Croft marvelled at Novak Djokovic's character after he won the ATP World Tour Finals.
We take a look back at the ATP World Tour Finals and ponder what the future holds for the event.
Sky Sports takes a look back and the biggest success stories and failures from the last week in sport.