The ATP World Tour Finals are the annual season-closing event in the tennis world, pitting the year's best eight singles players and doubles duos up against each other in one big showdown.

Once again the tournament is taking place at London's O2 Arena, its home for the last few years, with support from the new sponsor Nitto. Here's everything you need to know about when it's taking place, who's playing, how to watch live, and how to get some of the last few tickets.

When are the ATP Finals?

The World Tour Finals are taking place in London right now, from 11-18 November 2018. There are two singles matches and two doubles matches each day except the final Sunday, with the first six days devoted to the group stages (more on that below), the semi-finals on Saturday 17th, and the finals on Sunday 18th.

Who's playing?

First up, British hopes are limited. Andy Murray is still recuperating from hip surgery, so is nowhere near the top 8 singles players, while current British number one Kyle Edmund narrowly missed out - he's ranked 14 right now.

We do at least have Jamie Murray competing in the doubles along with Brazilian player Bruno Soares. It'll be Murray's fourth Tour Finals, and this third with Soares - they've made it to the semi-finals both of the previous two years, and come into this seeded fourth, so they have a good shot at the prize.

Beyond the Brits, there are two other high profile absences. Both Rafael Nadal and Juan Martin del Potro have withdrawn from the competition due to injury, giving Kei Nishikori and John Isner the chance to sneak into the tournament.

Here's the full singles draw:

Group Guga Kuerten

Group Lleyton Hewitt

Novak Djokovic (1) Roger Federer (3)
Alexander Zverev (5) Kevin Anderson (6)
Marin Cilic (7) Dominic Thiem (8)
John Isner (10) Kei Nishikori (9)

And here are the doubles players:

Group Knowles/Nestor

Group Llodra/Santoro

O Marach / M Pavic (1) J S Cabal / R Farah (2)
L Kubot / M Melo (3) J Murray / B Soares (4)
M Bryan / J Sock (5) R Klaasen / M Venus (7)
P-H Herbert / N Mahut (9) N Mektic / A Peya (8)

What's the tournament format?

The ATP World Tour Finals are a bit different to most of the other tournaments through the year. Rather than a knock-out format, the contest uses the round robin structure. 

That means that across the first six days, each player (or doubles pair) will play every other player in their group, for a total of three matches each. The top two players/teams from each group will advance to Saturday's semi-finals, and the winners of those matches play in Sunday's final.

Players get 200 ATP ranking points per round robin win, 400 for a semi-final win, and 500 for a final win - for a potential total of 1500 points for an undefeated champion. Meanwhile prize money goes up to a potential $2,712,000 for an undefeated singles champion, and $517,000 for doubles - again, with the final money depending slightly on how many matches they win along the way.

All the singles matches are the best of three sets, with tie-breaks, including the final. All doubles matches are two sets with a match tie-break.

How to watch on TV or online

If you're in the UK, coverage rights are shared by the BBC and Sky Sports. Sky is by far the better bet if you have it though, airing every single match from the tournament on either Sky Sports Mix, Sky Sports Arena, or Sky Sports Main Event. If you don't have Sky Sports you can sign up here.

Alternatively, it's usually cheaper to sign up for the Now TV Sky Sports pass -  it costs just £12.99 to get a full week (so you can watch almost the whole tournament). You can watch Now TV through your computer, phone, tablet, or smart TV - though if you just want to use your phone, you're better off with the budget-friendly £5.99 mobile pass. If you don't mind committing for a while, right now you can get 9 months of Now TV Sky Sports for just £179 - when it would usually cost more than £300.

If you'd rather not pay for Sky, the BBC has a tentative coverage schedule. Play every day except the final is on BBC Two from 2pm (so the afternoon matches) - note that this means only half the tournament's matches will be shown live on the BBC. Coverage of the final will take place from 6pm on BBC Two. 

You'll also be able to watch the BBC coverage online through the BBC Sport website or app, where you should be able to watch from your computer, smartphone, tablet, or smart TV, though we expect this will be limited to the same matches the BBC is airing on TV.

If you're in the US, your main option is ESPN. Remember that match times are in the UK, so the US will get them in the morning and afternoon, rather than the afternoon and evening.

Finally, wherever you are in the world you can also watch every match on Tennis TV, the ATP's official streaming platform. You can choose to pay either monthly or annually, and it includes almost every ATP tournament (but not the WTA, Davis Cup, or any of the Grand Slams). Bear in mind though: from 2019 Amazon Prime will also have streaming rights for the ATP tour, which will likely be a better value option given all the other membership perks, so for now you might be better off sticking to a monthly purchase.

How to buy tickets

If you live in (or near) London and want to get down to the O2 to watch some of the action live and in person, it's still possible. The official ticketing site for the tournament has tickets available for every day except the final (at the time of writing), with the option to buy tickets for either the afternoon or evening session (each of which gets you one singles and one doubles match) or a full-day ticket for a full four matches.

However, if you've got your heart set on the final, there are some tickets for that still available on Stubhub and Seatwave, along with all the other dates.