Unlike most of the other events on the men's tour, the ATP World Tour Finals is not a straightforward knock-out tournament. The eight players are divided into two groups of four, and play three round-robin matches each against the other three players in their group. From there, the two players with the best records in each group progress to the semifinals, with the winners meeting in the final to determine the champion.

Location: London, UK

Venue: O2 Arena

Surface: Hard/Indoors

Prize money: $4,450,000

Website: www.barclaysatpworldtourfinals.com