Djokovic wins ATP World Tour title

The ATP World Tour Finals is the season-ending championship of professional men's tennis played on indoor hard court.

It is held annually in November at the O2 Arena in London, United Kingdom.

First held in 1970, the tour features top eight singles players and doubles teams of the ATP rankings.

The current champions (2014) are Novak Djokovic in singles and Bryan brothers in doubles.

Unlike all other singles men's tennis events, the ATP World Tour Finals is not a straightforward knock-out tournament.

Eight players are divided into two groups of four and play three round-robin matches each against other players in their group.

The two players with best records in each group progress to the semifinals, whose winners meet in the final to play for the title.

Djokovic, Federer, Berdych and Nishikori were put together under Group A-Stan Smith Group.

Murray, Wawrinka, Nadal and Ferrer played each other in Group B-llie Nastase group.

Federer emerged on top Group A unbeaten with Djokovic coming second having lost only one match, to Federer.

Nadal came top of the Group B unbeaten while Wawrinka won a tight contest beating Murray to finish second.

The semi final matches had Roger Federer facing his fellow compatriot Stan Wawrinka and Nadal against Djokovic.

Djokovic beat Nadal in straight sets 6-3, 6-3 to reach the tournament final.

Federer also overcame Wawarinka easily in two sets 7-5, 6-3 to enter the final round.

This would be the 10th year-end championship final for Federer, who had previously won 6 of them.

Novak Djokovic capped a remarkable season beating Roger Federer to claim a record fourth straight ATP World Tour Finals title.

The world no.1 beat his long-time rival 6-3 6-4 in a one-sided title match at the O2 Arena which lasted just 81 minutes.

With this, Djokovic has drawn level with Federer in their head to head at 22 wins each