The Barclays ATP World Tour Finals is the climax of the men's professional tennis season and sees the top eight singles players alongside the top eight doubles teams fight it out to be crowned ATP World Tour Champions.

Initially, the players are split into round-robin groups of four with the top two players or teams in each group progressing to the semi-finals and subsequent final.

In 2008, Novak Djokovic won the singles title while Daniel Nestor and Nenad Zimonjic picked up the doubles title.

The first year-end championship for men's professional tennis, known as the Masters, was held in 1970.

Tokyo played host to this inaugural event and was followed as a venue by Paris, Barcelona, Boston, Melbourne, Stockholm and Houston before it finally settled at New York's Madison Square Garden between 1977 and 1989.

In 1990, the event became known as the ATP World Tour Championship and was held in the German cities of Frankfurt and Hannover until 1999.

The Tennis Masters Cup was then born in 2000 and was competed for in Lisbon, Sydney, Houston and Shanghai. 

Now named the Barclays ATP World Tour Finals, London will be welcoming the event for the first time when it comes to the O2 Arena in November 2009.

Previous singles winners

Previous doubles winners

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