Welcome to our LIVE coverage of the ATP World Tour finals.

That's all for now. Join us later when Milos Raonic takes on Novak Djokovic.

Both players here today were debutants and it looks as if Monfils' tournament is over already. A tremendous comeback, nonetheless, from what looked to be a troubling injury. Monfils was unlucky today, I think, but he'll need more than luck to make it through now.

Monfils 3-6 6-1 4-6 Thiem: He doesn't get one. It's game, set and match to Thiem which seems pretty unfair, if I'm honest.

Monfils 3-6 6-1 4-5 Thiem: Thiem could win this now and Monfils is choking in the most spectacular way, double fault after double fault. He needs to keep his nerve now. We're on match point - Monfils needs an ace.

Monfils 3-6 6-1 4-5 Thiem: Monfils leaps an lands awkwardly - that looks like it has really troubled him as he twists his knee. It doesn't slow him down massively but Thiem holds anyway.

Monfils 3-6 6-1 4-4 Thiem: Thiem looking like he's going to break at last lets Monfils back in the game with another miplaced shot. Monfils calls Thiem's return but hawkeye says no which should really have been the moment for Thiem to turn it around, but the Frenchman is playing catch up. There are massive inconsistencies in Thiem's return which Monfils duly capitalises on.

Monfils 3-6 6-1 3-4 Thiem: Monfils looking sharp as he returns what would have been an impossible shot for many as it fires down the tramlines. His court coverage is just sublime and even when he ends up on his back, the way he gets there is impressive. Nonetheless, we're still without a break in the third set.

Monfils 3-6 6-1 2-3 Thiem: A more confident showing from Thiem, now. Monfils grimacing again a bit as he misses a point by misplacing the shot a little. Tough to call how this will go at this stage.

Monfils 3-6 6-1 2-2 Thiem: You'd struggle to know Monfils was limping at the end of the first set now - he's only dropped two service points since the beginning of the second. set and he looks pretty relaxes.

Monfils 3-6 6-1 1-2 Thiem: A few misfires from Thiem as Monfils makes a strong defence against the Austrian's serve. Thiem's placement is a little inconsistent, but he holds his serve, anyway.

Monfils 3-6 6-1 1-1 Thiem: A much more confident serve for Monfils, who despite some stretching in the break looks on pretty decent form by now.

Monfils 3-6 6-1 0-1 Thiem: Thiem holds his serve but Monfils is making him work for it, now. Thiem's first serve dropped off in the second set and didn't start all that well in the first game of the decider.

Monfils 3-6 6-1 Thiem: Monfils absolutely storms his final game and serves out without dropping a point. Thiem looking a little crestfallen now as Monfils takes the second set.

Monfils 3-6 5-1 Thiem: Monfils just looks like he's given up at times, making an early call not to risk whatever his injury may be by not running for the ball. At other times, his athleticism is incredible, reaching wide to return what looks like an impossible shot. Just as the comeback looked like a flash in the pan, Monfils breaks agin.

Monfils 3-6 4-1 Thiem: Just as I was about to make a joke about Mourinho's inevitable kiss of death... Thiem has broken back.

Monfils 3-6 4-0 Thiem: Thiem looks like he's losing it a bit here, he's made a number of errors here and he's making it easy for Monfils now. Monfils who, as you will recall, looked almost as if he wasn't going to be able to finish the match not long ago.

Monfils 3-6 3-0 Thiem: Monfils gathering pace now, Thiem will be hoping no to repeat his performance against Djokovic on Sunday after he dropped his lead of one set to give Djokovic the win.

Monfils 3-6 2-0 Thiem: A brilliant point for Monfils as he just makes it to the baseline to return. If you'd been watching Monfils earlier in this match you'd not have thought him capable of that. He breaks at last.

Monfils 3-6 1-0 Thiem: Monfils needs to make better use of his serve if he wants to come back from this. He's obviously in discomfort and he's not able to show the mobility we'd normally expect to see of him. He manages to hold his serve but it is quite tight.