Plus don't miss our live blog, video clips and Petchey at the Sky Pad
Sunday 13 November 2016 11:34, UK
Andy Murray faces the ultimate challenge to retain his position as the top-ranked player in world tennis from Novak Djokovic, but six other stars are out to stop him.
Britain's finest Murray is riding a crest of a wave at the moment having won tournaments in Beijing, Shanghai, Vienna and capping off a stunning five weeks with victory at the Paris Masters 1000 event last weekend.
You can watch every single game, set and match live on Sky Sports, as well as stay across all the action and reaction on our digital platforms. Here's how…
WAYS TO WATCH
Live coverage on Sky Sports and Sky Sports for iPad app: don't miss a shot as Andy Murray aims to close out the year with his first victory at London's O2. Here's the schedule. For Sky Sports' tennis listings in full click here.
Bob Bryan & Mike Bryan v Ivan Dodig & Marcelo Melo - Coverage beings at 12.00pm on Sky Sports 3.
Not before 2pm: Novak Djokovic v Dominic Thiem
Jamie Murray & Bruno Soares v Treat Huey & Max Mirnyi - Coverage beings at 6.00pm on Sky Sports 3.
Not before 8pm: Milos Raonic v Gael Monfils
Pierre-Hugues Herbert & Nicolas Mahut v Raven Klaasen & Rajeev Ram - Coverage beings at 12.00pm on Sky Sports 1.
Not before 2pm: Stan Wawrinka v Kei Nishikori
Feliciano Lopez & Marc Lopez v Henri Kontinen & John Peers - Coverage beings at 6.00pm on Sky Sports 2.
Not before 8pm: Andy Murray v Marin Cilic
Groups will alternate for the rest of the week until the semi-finals, which take place on Saturday 19 November - on Sky Sports 3 from midday, with the finals on Sunday 20 November - starting on Sky Sports 5 from 3.30pm.
Our punditry team for the Tour Finals includes Mark Petchey, Barry Cowan, Greg Rusedski, Leif Shiras, Peter Fleming and Annabel Croft, with further expert analysis coming from our studio led by presenter Marcus Buckland.
Sky Sports for iPhone / Android / iPad and skysports.com: don't miss our live rolling blog of each game featuring in-play video clips of all the key moments, as well as match reports, news, reaction, analysis and videos.
Sky Go: stay with the action online, on iPhone, iPad or selected Android smartphones with the Sky Go app.
Twitter: follow @SkySportsTennis for score updates and news throughout the week.
Sky Q: the best of our video content showcased on our next generation box, which can record and store more than before and even save recordings to your devices to watch when you're out and about. Sky Q customers can also use the Sky Sports News HQ app to get scorecards and video clips as well as catching up with highlights via the red button.
Check our game-by-game coverage from all group matches at the ATP World Tour Finals in London - including Andy Murray - on skysports.com/tennis, our app for mobile devices and iPad and our Twitter account @skysportstennis.
