Piers Newbery
BBC Sport at the O2 Arena in London

"After a month of uncertainty as to whether Murray would actually turn up at the O2 Arena, the British number one has been in remarkably relaxed mood around the place over the last few days. A quick training block at Queen's Club got some clay-court practice in the bank ahead of the Davis Cup final, and it was back to indoor hard courts towards the end of last week. His record at the O2 is not that spectacular, and his priority is the Davis Cup, but there is little chance he will give anything less than 100% once the umpire calls 'play'."

Image source, Getty Images

Andy Murray spent much of last week practising on clay at Queen's Club in preparation for the trip to Belgium, but for this week at least the hard courts of the 02 will be his home. 

The Briton has made no secret of the fact that the chance to win the Davis Cup is his priority, but he could play five matches before going to Belgium for Britain's first Davis Cup final since 1978 next week.  

With captain Leon Smith set to name his team on Tuesday, our question is - who should be the team's second singles player (and why)? Tweet us using the hashtag #bbctennis. 

Heather Watson
British number two on Radio 5 live sports extra

Yes, Andy Murray will be hoping to finish the year for the first time as the world's second best player. 

He can secure second spot by winning two matches at the 02, or he will do so if Roger Federer does not win the title. There are other scenarios, but we haven't got all day. 

Image source, Getty Images

If history tells us anything it is that the winner of the first set in this match will probably go on to win the tie. 

Andy Murray and David Ferrer are the only two players on the ATP Tour with undefeated records after winning the first set. 

Murray is on a 68-match winning streak after taking the first set, while Ferrer last lost after winning the first set in 2014 to Kei Nishikori at the 02. So there. 

Image source, Getty Images

Tim Henman
Former British number one on BBC Two

Piers Newbery
BBC Sport at the O2 Arena in London

"The great and the good of British tennis are in place - Tim Henman hurries past with a few hellos for his old sparring partners in the British press, there is a cheery wave from an orange-clad Heather Watson as she makes her way to the BBC radio commentary box, while Andrew Castle and Sue Barker are deep in conversation ahead of the lights going up on BBC2. 

"Meanwhile, the walkways are heaving as 17,800 spectators decide to make one last trip to the facilities."

We have pictures! Live pictures! As well as reading these words, you can also watch Andy Murray take on David Ferrer on this page (and on BBC Two), plus listen to live BBC Radio 5 live sports extra coverage. 

All live coverage is available in the, well, 'live coverage' tab above. 

Too much of a good thing can be a wonderful thing. 

Hello! Welcome to live coverage of the ATP World Tour Finals scrap between Andy Murray and David Ferrer. 

It could be a wonderful month for the British number one. He could end the year as the world number two. He could end up leading Great Britain to David Cup glory.

Will it be a month of historic achievement or disappointing defeats? Today we at least find out how the story begins.

Image source, BBC Sport

There's no respite for the successful, no winding down after an arduous season. The more you win, the more you play. The stakes become higher, and the pressure rises and this week the stress and the tension is cranked up a notch further.

Image source, Getty Images