The 2018 ATP Finals (also known as the 2018 Nitto ATP Finals for sponsorship reasons) is a men's tennis tournament.
The 2018 ATP Finals will take place from 11 to 18 November at the O2 Arena in London, United Kingdom. It will be the 49th edition of the tournament (44rd in doubles). The tournament is run by the Association of Tennis Professionals (ATP) and is part of the 2018 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.