In Pictures: The ATP World Tour Finals

After another strong year, Novak Djokovic enters the tournament as the world number one. The ATP finals see Djokovic and the next top seven players in the world battle for the title. The Serbian opened with victory over Jo-Wilfried Tsonga [GALLO/GETTY]]

Fans hold up the number of majors won by tennis legend Roger Federer. With six ATP World Tour titles to add to the pile, he is one of the favourites. Federer showed his pedigree with a quick two-set victory over Janko Tipsarevic [GALLO/GETTY]

David Ferrer smiles after victory in his opening match against Martin Del Potro. The Spaniard(***)s good spirits are understandable as only last week he won his first masters in Paris. But can he go one better in London? [GALLO/GETTY]

Andy Murray could not follow up his opening victory with another in front of home support, but he had a good excuse. He was up against arch-rival and world number one Novak Djokovic. The Brit put up a gutsy battle during another epic match between the two [GALLO/GETTY]

Tomas Berdych celebrates winning his second match against Jo-Wilfried Tsonga. Along with Djokovic and Murray, Berdych can still go through to the next stage of the competition [GALLO/GETTY]

Chelsea(***)s midfield maestro Juan Mata enjoys an afternoon at the tennis watching Roger Federer grab the first spot in the next stage. A win over Mata(***)s Spanish compatriot David Ferrer was enough to see the Swiss star comfortably through [GALLO/GETTY]

Martin Del Potro got his first win under his belt against Janko Tipsarevic. But with one match remaining in the group stage against Roger Federer, it(***)s going to be tough for the Argentinian to get any further [GALLO/GETTY]

Novak Djokovic remained unbeaten in the tournament and guaranteed himself a place in the next round alongside Roger Federer with a closely-fought victory over Tomas Berdych [GALLO/GETTY]

Frenchman Jo Wilfried-Tsonga (pictured) lost his final match in the tournament to Andy Murray who progressed with Novak Djokovic to the semi-finals [GALLO/GETTY]

Martin Del Potro provided the biggest shock of the tournament defeating Roger Federer to keep himself in contention of a semi-final place. It was Federer(***)s first defeat in three years at the finals [GALLO/GETTY]

But it was not to be - Djokovic overpowered del Potro 4-6, 6-3, 6-2 to reach the final – he is the only player in the eight-man event to win all three round-robin matches [Reuters]

And he will play Roger Federer after the Swiss champion defeated third seed Andy Murray 7-6 (7/5), 6-2 cheered on by a rapturous crowd at the O2 Arena [Reuters]

And the winner is ... Novak Djokovic who produced a masterful display to end Roger Federer’s reign as the ATP Tour Finals champ. Djokovic swept to victory in a 7-6 (8/6), 7-5 thriller [Getty]