2015 ATP World Tour Finals
| 2015 ATP World Tour Finals | |
|---|---|
| Date | 15–22 November |
| Edition | 46th (singles) / 41st (doubles) |
| Category | ATP World Tour Finals |
| Draw | 8S/8D |
| Prize money | $7,000,000 |
| Surface | Hard / indoor |
| Location | London, United Kingdom |
| Venue | The O2 Arena |
| Champions | |
| Singles | |
 Novak Djokovic
|
|
| Doubles | |
 Jean-Julien Rojer /  Horia Tecău
|
|
The 2015 ATP World Tour Finals (also known as the 2015 Barclays ATP World Tour Finals for sponsorship reasons) was a men's tennis tournament that was played at the O2 Arena in London, United Kingdom, between 15 and 22 November 2015. It was the season-ending event for the best singles players and doubles teams on the 2015 ATP World Tour.
The 2015 ATP World Tour Finals took place from 15 to 22 November at the O2 Arena in London, United Kingdom. It is the 46th edition of the tournament (41st in doubles). The tournament is run by the Association of Tennis Professionals (ATP) and is part of the 2015 ATP World Tour. The event takes place on indoor hard courts. It serves as the season-ending championships for players on the ATP Tour. The eight players who qualify for the event are split into two groups of four. During this stage, players compete in a round-robin format (meaning players play against all the other players in their group). The two players with the best results in each group progress to the semifinals, where the winners of a group face the runners-up of the other group. This stage, however, is a knock-out stage. The doubles competition uses the same format.
The ATP World Tour Finals has a round-robin format, with eight players/teams divided into two groups of four. The eight seeds are determined by the ATP Rankings and ATP Doubles Team Rankings on the Monday after the last ATP World Tour tournament of the calendar year. All singles matches are the best of three tie-break sets, including the final. All doubles matches are two sets (no ad) and a Match Tie-break.
The ATP has announced that the group names will be changed from A and B to that of former champions of the event. In 2015 the groups will be renamed after the first two champions Stan Smith (1970) and Ilie Năstase (1971-73, 75).
Eight players compete at the tournament, with two named alternates. Players receive places in the following order of precedence:
In the event of this totaling more than 8 players, those lower down in the selection order become the alternates. If further alternates are needed, these players are selected by the ATP.
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