Andy Murray faces Kei Nishikori and Roger Federer takes on Milos Raonic on the opening day of the ATP World Tour Finals at the O2 Arena in London.
Where to Watch
Kei Nishikori v Andy Murray is live on BBC Two, Sky Sports HD3 and BBC Radio Five Live Sports Extra from 2pm.
Roger Federer v Milos Raonic is live on Sky Sports HD3 and BBC Radio Five Live Sports Extra from 8pm.
The season-ending tour finals, taking place at the O2 Arena in London for a sixth straight year, gets under way in some style in Group B with Andy Murray facing Kei Nishikori and Roger Federer taking on Milos Raoinic.
Murray returns to the ATP Finals for the first time since winning the Wimbledon title in 2013 but could walk into a wall of hostility having declared his support for Scottish Independence in September.
His opponent is US Open runner-up Nishikori, the who will become the first Asian player to face in the tournament this week in his maiden appearance.
The Briton has a 100% win record over Nishikori and, aiming to better his two previous semi-final appearances will be seeking to maintain that record and take advantage of the Japan's player's late-season weariness.
The second round robin match in the evening session sees six-time champion Federer begin his campaign against another debutant in Raoinic, who defeated him at the Paris Masters last month.
The 6ft 5in Canadian could provide a real threat to both Federer and Murray in London with his dominant serve however the varied fortunes of debutants in this competition provides no guarantees over his potential impact.
What they said:
Kei Nishikori: "I might get nervous first time but I'll try to play my best tennis and try not to think too much of it being the Tour Finals. It's a great achievement to play in the Finals for the first time. Last year I started thinking about playing there, so it will be really great."
Andy Murray: "Winning matches is how you play yourself into form and that's what I needed to do at this time of year,' This week in practice I've been OK. The practices have been hard – you're practising with the best players in the world so that's always tough, but it's good."
Roger Federer: "I lost [to Raonic in Paris] because he played well and I can accept that. It's definitely more up to me than up to him, potentially. As I'm feeling good I'm actually happy I have the chance for a rematch."
Milos Raonic: "For me the main focus, which is very different from any other week, is finding my best tennis right from the first match. The general excitement of being here in London puts everything aside. Qualifying for here signifies mostly a successful and year and it is now about trying to end the on an exclamation mark."