GAME, SET AND MATCH! - THIEM 4-6 1-6 GOFFIN. David Goffin clinches a semi-final clash with Roger Federer after beating an error-prone Dominic Thiem in a winner-takes-all battle that lasted just one hour and 11 minutes. The Belgian overcame an early onslaught from his opponent to play with real consistency, allowing Thiem to be his own worst enemy with a succession of unforced errors. The Austrian didn't even pose the serve-out question as he double faulted to allow Goffin to seal it on his second match point.
Dominic Thiem - David Goffin
ATP World Tour Finals - 18 November 2017
World Tour Finals – Follow the Tennis match between Dominic Thiem and David Goffin live with Eurosport. The match starts at 01:00 on 18 November 2017. Our live coverage lets you follow all the key moments as they happen.
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THIEM 4-6 1-5 GOFFIN. The Belgian shows his first sign of nerves - and there are plenty in what is easily the longest game of the match. He gives Thiem real hope with some tight errors and a couple of double faults. The Austrian passes up four break back opportunities as he pressures Goffin from deuce. It doesn't come good for the Austrian, however, and Goffin gets over a major hurdle to move within one game of victory.
BREAK! - THIEM 4-6 1-4 GOFFIN. Le Goff has hit some nice winners so far this afternoon, but he's also been savvy enough to know that Thiem has been wildly misfiring. The Austrian follows up his first ace of the match by slapping a tired-looking shot into the net to offer up another break. Goffin has played the percentages by just staying in rallies and earns himself a virtual match point as Thiem hooks a backhand well wide to all-but kill his chances.
THIEM 4-6 1-3 GOFFIN. That's an important hold. Goffin hits a very wide second serve on break point. Thiem eventually blasts long, but if he'd challenged he would have had the break back. Instead, Goffin comes through from deuce, sealing it with an ace to consolidate.
BREAK! - THIEM 4-6 1-2 GOFFIN. When the errors leak they come like London buses. Thiem presents Goffin with double break point and the Belgian needs jus the one, forcing the mistake with a crisp forehand to the left wing he is facing.
THIEM 4-6 1-1 GOFFIN. Anything you can do.... Goffin chalks up his own perfect game, finishing off with an intelligent serve-volley combo.
THIEM 4-6 1-0 GOFFIN. Thiem comes out all guns blazing and surges to an emphatic hold to love. He's capable of crushing an opponent, but can he keep it going long enough to turn this match around?
Thiem currently receiving some treatment on his left knee.
SET! - THIEM 4-6 GOFFIN. Le Goff takes the opener, fighting hard from 15-30 to serve it out in 31 minutes. Thiem almost earned a break back point, but the challenge on his pass down the line was shown to be a millimetre out.
THIEM 4-5 GOFFIN. Thiem finally puts a halt to his abysmal run. He finds some super rhythm on serve and waltzes to a love hold. Over to Le Goff to try and serve it out now.
THIEM 3-5 GOFFIN. A big serve and another simple point for Le Goff as he consolidates to make it five on the spin. This set is racing by.
BREAK! - THIEM 3-4 GOFFIN. It's four in a row for the Belgian. Thiem is all at sea, offering up triple break point with another double fault. A sublime crosscourt winner off the backhand offers a brief glimpse of what he can produce, but it doesn't dig him out the hole. Goffin in control.
THIEM 3-3 GOFFIN. All square. The Thiem tornado came to a rather abrupt end there. Goffin has settled and easily holds to love.
THIEM 3-2 GOFFIN. This is why Thiem hasn't quite made the waves his exciting style of tennis promises. He's prone to games where he goes too big - and this is one of them. Three unforced errors are followed by a double fault. Goffin had very little to do but is delighted to get the break back to love.
THIEM 3-1 GOFFIN. A much-needed hold for David. He finds some hefty first serves to take control and then gets himself on the board with a cute volley at the net that completely wrong-foots Thiem.
THIEM 3-0 GOFFIN. Just 10 minutes played and Thiem is well and truly in the driving seat. Goffin leaks errors to offer up cheap points and the No.4 seed gratefully tucks them into his back pocket to consolidate to 15.
BREAK! - THIEM 2-0 GOFFIN. A good start becomes a perfect one for the Dominator as he breaks to love. The Austrian won an epic rally for 0-30 and then produced a deep return before Le Goff fizzed long. The Belgian could have done without that, particularly given how he fell apart against Dimitrov in his last match.
THIEM 1-0 GOFFIN. Thiem roars out of the traps, but then suffers an early malfunction as Goffin comes from nowhere to make deuce. The Austrian No.4 seed refocuses and takes the next two points to ensure he gets off to a positive start in this crucial encounter.
Goffin won the toss and opted to receive. Thiem will get us underway with a last-four clash with Roger Federer at stake.
Goffin on Thiem: “I practice really often with Dominic. I have already an idea with the tactics against him because I played so many times against him. We played a lot of good matches against each other. It's not going to be easy.”
Thiem on Goffin: "We know each other very well. He played a very good match here, one very bad match. I don't know what to expect. I'm hoping that it's going to be a tough match, and I'm trying everything to go through to the semis.”
HEAD-TO-HEAD: This is their 10th meeting. Goffin leads the match-up 6-3 and has won the last two, including a four-set success at this year's Australian Open.
Hello and welcome to LIVE updates of the final round-robin matches at the 2017 Nitto ATP World Tour finals. First up, it's Dominic Thiem versus David Goffin in a straight shoot-out for the final semi-final berth. Winner takes all - loser goes home!