68' Substitution Michy Batshuayi Tunga Olivier Giroud
68' Giroud is being readied on the sideline for Chelsea, who are looking in big trouble now.
66' Fernandes has his first assist for United, for an inch-perfect corner.
66' GOOAALLL! United double their lead, Maguire comes in with a crashing header! The pressure tells as Fernandes delivers an excellent corner from the left towards the penalty spot, and the centre-half comes flying in to power the ball into the bottom-right corner.
59' Yellow card Kurt Happy Zouma
59' Yellow card Frederico Rodrigues Santos
57' This had already been a frustrating game for Chelsea, and that won't have made things any better for them. They are knocking on the door again, though.
55' Goal disallowed! Chelsea think they're level through subsitute Zouma - Wan-Bissaka makes a brilliant block to deny Mount from close range, but the Frenchman turns in right-footed from the resulting corner. The celebrations are cut short, though, with VAR deciding Azpilicueta had pushed Williams as the cross came in.
54' James is finding space in the channel for Chelsea now, with Willian pushing out wider. He clips in another cross which eventually leads to Mount firing off the post, but the whistle had already gone for handball against Batshuayi after Bailly headed the ball down onto his arm.
52' James fizzes a ball into the feet of Mount, but Matic steps up ahead of him to intercept just outside the area.
51' Fernandes plays a nice-looking ball in behind for Martial to chase down the left channel, but right-back James beats him for pace and sweeps up the danger.
50' Willian bends in a cross from the right. It's a decent enough shape on the ball, but well overhit and it flies out for a throw-in on the other side.
45' Assist Aaron Wan-Bissaka
45' GOAL! Manchester United lead out of nowhere, it's Martial! Fred found Wan-Bissaka on the right, and he turned Willian inside out before firing in a superb right-footed cross. Martial then did brilliantly to get above Christensen and flick a header just inside the far post.
44' It looks as though Christensen took a whack to the nose from Martial as he hauled him down, as he's gone off with a bloody handkerchief to his face. He'll get patched up, and should be ok to carry on.
43' Willian's booking for diving on 35 minutes was Chelsea's third of the season, taking them level with United. No team has more than three.
38' Martial finds Shaw on the overlap, the 24-year-old popping up unexpectedly on the left from his starting berth in a back three. He finds himself in all sorts of space but wastes the chance completely, firing a cross high over the crossbar.
37' That's United's biggest chance so far. Martial plays a one-two with Fernandes on the left touchline and drives into the area from wide, but he gets the finish all wrong. It looks a simple enough chance, but he side-foots wide of the far post with his right.
35' Drama! Willian goes down in the area from the resulting corner, but is booked for diving. He went over an outstretched foot from Fernandes, but there didn't look to be much contact on first viewing.
32' Fernandes has his first pop from range, looping a right-footed effort wide to the right of goal from 25 yards. Still no shots on target from either side.
31' Fernandes finds James in space through the centre, and the Welshman carries it forward before spreading the play to Williams on the left. He gets the cross in, but Kovacic covers well and stretches a boot to tip it behind for a corner.
30' Azpilicueta stands up a delightful first-time cross from the left byline, but Willian can't get over Maguire to turn it goalwards.
29' James looks to slide a ball in to the feet of Batshuayi after drifting in from the right, but he goes down and no foul is given.
23' Batshuayi should score! A Chelsea corner is never properly cleared and the ball is worked back into the area, flicked on first by Christensen, then Willian to find the Belgian eight yards out. He doesn't react quickly enough and scuffs a shot straight up into the air.
22' Maguire tumbles in a heap by the touchline and Batshuayi runs into his outstretched boot crotch-first, leaving the nearby Chelsea bench furious. There's a quick VAR check for a red card, with nothing given.
21' Martial gets into some space at the left corner of the penalty area and looks to bend a shot towards the far corner, but it's immediately charged down.
19' United look to pass their way around the Chelsea defence, but can't find a way through and Chelsea counter. Pedro runs into Fred just outside the area and wants a free-kick, but referee Anthony Taylor isn't impressed.
17' Wan-Bissaka gets over to make a good block on an attempted cross from Azpilicueta on the left. The resulting throw-in sees Pedro then get the better of the right-back, but his fizzed cutback is hacked away.
15' Chelsea make a bit of a mess of playing the ball out of defence, but they just about hold onto the ball long enough for Caballero to spring the press with a long ball forward. In the end, Batshuayi can't control Jorginho's overhit pass in behind the United defence.
13' United can't make anything of the corner, which is cleared after a second ball comes in.
12' Mount is indeed the man to come on for Kante, who has limped off.
12' United put together their first real move of the evening, as Fernandes and Fred combine at the edge of the area to tee the latter up for a shot. He hits it well but it deflects over the bar off Rudiger.
10' Early trouble for the home side, as Kante goes down. The physios are on to assess him, with Barkley and Mount both sent to warm up on the touchline.
9' Chelsea threaten down the right again, and again it's Kovacic who leads the charge down the other side of the pitch. He looks to be fouled but Pedro plays on and finds the Brazilian in space on the right. He comes infield and shoots, but De Gea can watch it comfortably over the crossbar.
6' Close from James! Kovacic leads a Chelsea attack with a powerful run through midfield, exchanging passes with Azpilicueta before finding James at the right corner of the penalty area. He makes room for a shot and fires hard across goal towards the far bottom corner, but drills it just wide.
4' United have failed to score in four of their last five Premier League games, including each of the last three. They last failed to score in four consecutive league games back in April 1989.
3' Bailly turns well away from Batshuayi, but holds the hall too long and runs straight into Pedro. Chelsea get the ball midway inside the United half but luckily for the away side, Kovacic's pass into the penalty area is intercepted.
2' The first mistake of the evening comes from Chelsea, as Jorginho needlessly puts a first-time pass straight out of play at the halfway line.
1' We're off! United get the ball rolling with Fernandes taking kick-off.