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Key Events

74'
C. Chambers
Yellow Card
73'
N. Kanté
Yellow Card
64'
David Luiz
Yellow Card
51'
Azpilicueta
Yellow Card
41'
Diego Costa
Goal
0 - 1

Match Stats

Possession
42% 57%
7
6
Shots Off Target
Shots On Target 1 3
Total Passes 451 620
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Key

UEFA Champions League
UEFA Champions League Qualifiers
UEFA Europa League
Relegation

Commentary

That's all for our live coverage from the Riverside Stadium, thanks for following along. Goodbye!
Diego Costa's 41st minute goal was enough for the Blues, who make it six wins and clean sheets in a row, taking their place atop the Premier League table.
90' + 4' FULL-TIME: MIDDLESBROUGH 0-1 CHELSEA.
Oscar
E. Hazard
90' + 2' Substitution Eden Hazard Oscar dos Santos Emboaba Júnior
90' + 2' Chelsea break as another period of Boro pressure comes to nothing, and Costa shows some good, industrial play to get forward, but he's surrounded by red shirts and winds up conceding a free-kick.
B. Ivanović
V. Moses
90' It is Branislav Ivanovic who comes on as Chelsea make their second change, replacing Moses.
90' There will be four minutes added on at the end of this match.
G. Leadbitter
A. Forshaw
89' Boro's final change sees Grant Leadbitter replace Forshaw.
88' Everyone forward for Middlesbrough as they look to make a final push for the elusive equaliser. Chelsea have Ivanovic ready to come on, which suggests Conte is a bit worried about these final minutes and would be content with getting out of here with the 1-0 scoreline.
86' OVER! Plenty of anticipation building as the referee sorts a few things out with the wall, Cahill proving a real nuisance as he tries to force his way in there to create a lane for Luiz. In the end it's all for nothing, however, as the Brazilian's effort is high and handsome, but if not for anything else, it ran close to 90 seconds off the clock.
84' Chelsea trying to assert themselves in the final third in the hopes of seeing this through comfortably - knowing a second goal would be the best way to avoid a tense finish - and they have a great chance here as Hazard is felled on the edge of the box by Ramirez. It's a soft foul, but it had to be given. Ramirez isn't happy with himself here.
82' So finely poised and wonderfully entertaining, this second half has been, and it's shaping up to be a brilliantly tense final 10 minutes at the Riverside. It's still very much hanging in the balance, and there continues to be a great tempo to the match.
N. Chalobah
Pedro
80' Pedro leaves without scoring, coming close twice, but he departs here with Nathaniel Chalobah replacing him.
78' STUNNING SAVE! A piece of brilliance from Courtois when Chelsea needed it most! The towering Belgian got down to his left in a heap to deny Negredo's half-volley at the near post, with the Spaniard teeing himself up superbly with a delightful little flick.
76' STAT: Middlesbrough have lost their last five Premier League games against Chelsea, failing to score in each match.
C. Chambers
Yellow Card
74' The yellows are coming in fast and furious now, with Chambers the latest player to be booked, this for a foul on Costa in midfield.
N. Kanté
Yellow Card
73' Kante doesn't like this decision, but he doesn't have much of a case as he wraps his arms around Ramirez to drag him down in midfield, and goes into the book as a result.
V. Fischer
A. Clayton
73' The stoppage allows Boro to make their second change as Viktor Fischer comes on to provide an attacking punch from midfield, replacing the more defensive Clayton.
S. Downing
Fábio
71' A positive switch here from Karanka who brings on Stewart Downing, with Fabio replaced. He will likely play at left-back, but offers more creativity going forward, and another threat from set-pieces.
69' Chelsea have weathered the storm a bit and are back to dictating possession here, patiently building on the fringes of the final third. The sense still is that there's more goals in this one, so Chelsea may need another to ensure they leave with all three points.
67' STAT: Chelsea are 14 points better off this season after 11 games (25) than they were last season at this point (11).
David Luiz
Yellow Card
64' Back the other way come Boro and Luiz, tired following his run forward, is booked for a late challenge.
64' OFF THE BAR! That could have sealed it! Luiz clips a ball over the top for Costa, who tees up Pedro with a brilliantly cushioned header. Pedro takes the chance first-time, but rattles his effort off the underside of the bar with Valdes rooted to his spot!
62' Luiz has been a force in the air tonight and he's at it again here, getting a piece of Traore's cross in from the left to guide it safely back to Courtois, denying Negredo the chance. You can feel the buzz inside the stadium now, however. This one is far from said and done.
60' WELL BLOCKED! That's an important bit of defending from Cahill who shows good pace to get back and stick with Traore, eventually blocking the attacker's effort from 15 yards. Pressure stays on though, as momentum continues to shift in favour of the hosts.
58' It's started to rain here in northeast England, but it's more of a December rain than anything, as it has some snowy-like qualities. A combination of the weather, which these northeasters just love, and the latest Ramirez chance have got this crowd singing once again. This is the atmosphere Boro need to drive them forward.
56' HOW HAS HE MISSED THAT?! Boro can't afford to be squandering opportunities, especially ones of that quality. Negredo's clever flick tees up Ramirez on the edge of the box, in all sorts of space. He has a clean sight of goal, but can't even hit the target!
54' STAT: If Chelsea win this game without conceding, it will be the 10th time a Premier League club has won 6+ consecutive games without shipping a goal - Chelsea will have been responsible for half of those.
52' Ramirez tries to clip a shot over the wall from the ensuing free-kick, but the positioning of Courtios' wall is strong as they do their job to block it from going through on goal.
Azpilicueta
Yellow Card
51' Ramirez has hardly been involved this afternoon, but he does well here to win a free-kick, which sees Azpilicueta into the book.
50' If Boro are going to get back in this game they're going to need their creative types, Ramirez and Traore, to start getting more consistently involved. The latter does on this occasion, but he fails to pick out a decent throughball for Negredo following some good work in his own half.
48' Chelsea come flying out the gate and get a good, early chance through Alonso, but Valdes is again up to the task. Pressure back on straight away, and De Roon goes through Costa late, awarding the visitors a free-kick, though the striker certainly made the most of that one.
46' Here we go again...
Diego Costa's scrappy opener five minutes from half-time has undone all of Boro's great work in defence and provided Chelsea with the lead heading into the break. The goal has drastically altered the course of this match going forward, forcing Boro to scrap their gameplan as they will eventually be required to open up a bit in search of an equaliser.
45' + 2' HALF-TIME: MIDDLESBROUGH 0-1 CHELSEA.
45' There will be two minutes added on at the end of this match.
43' STAT: Diego Costa has been involved in more Premier League goals than any other player this season (13, 10 goals and three assists).
Diego Costa
Goal
41' CHELSEA BREAK THROUGH! And it just had to be Costa, didn't it! It's a sloppy one, as Boro don't accordingly deal with a corner, the ball taking a deflection and looping in the air off the back of Chambers. It drops at the near post and it's Costa who is most determined to get on the end of it, forcing a first-time effort through Valdes!
39' Valdes' facial expression suggests he's a little worse for wear, but he's back on his feet and looks keen on carrying on here.
38' SMART SAVE! Safe hands again from Valdes, who does well to parry an effort from Alonso, who had been picked out kindly by Kante, but there's a worry for Boro as the keeper collided with Fabio on the ground and has stayed down here. He's feeling the brunt of that coming together, which prompts Guzan to quickly start warming up, just in case.
36' Respite for Boro at the back as they slowly get the ball forward and win a throw deep in the Chelsea end. It comes to Traore, who runs beyond Kante and Cahill exceptionally to open up space on the flank, but the eventual ball in from Barragan is headed wide by Ramirez at the far post!
34' Another man who has impressed in this first half has been Fabio. Making his first Premier League start in over two years, he has been a stalwart at the back, running fervently up and down the flank, putting in some really crisp tackles and doing well to keep Chelsea to the outside, despite Ramirez largely neglecting his defensive duties.
32' Pressure building now as Valdes is called into action much more frequently. Some impressive work from Costa atop the area sees him fend off a few defenders before playing in Pedro, but the Spaniard opts not to shoot from in close, trying to send the ball across the face of goal for Hazard, but Valdes cuts it out soundly.
30' STAT: Middlesbrough are looking to win successive home Premier League games for the first time since August 2008.
28' SENSATIONAL GOALKEEPING! That very well may be the save of the season up to this point! Hazard dinks a neat ball over the top for Moses, who pulls it back for Pedro, and the Spaniard's first-time effort is somehow tipped over the bar by the fingertips of Valdes! Unbelievable! To make it even better, they used to be team-mates in Barcelona.
26' HANDBALL! That was a real worry for Luiz! A hopeful ball over the top from Barragan isn't dealt with accordingly by Luiz, who sends his header straight into De Roon, who takes it in stride and is able to run through on goal. He quickly pulls it back for Negredo, but the whistle sounds as Luiz's header was deemed to have been controlled by the arm of the Dutchman. 
24' While Chelsea have struggled to create, they have had no issues shutting down Boro's attempts to break on the counter. The visitors have done well to keep their shape in possession, so when they do give it away, even when it's a bit higher up the pitch, they have players in the right area to win it back quickly.
22' The work rate of these Boro players has been top notch. It's been very much a team effort to keep Chelsea out thus far, with everyone doing their part. Moses is enjoying some space on the right as extra attention is paid to Hazard on the opposite flank, but otherwise the Blues have had to fight for every inch of space.
20' STAT: Eden Hazard is making his 150th Premier League appearance in this game – he has 48 goals and 31 assists in his 149 league games for Chelsea.
18' FIRST CHANCE! Moses and Hazard work a clever give-and-go on the right, with the latter sending the former into the area. Moses cuts onto his left and hammers a strike towards the far post, but it crashes off the back of Costa and sails behind for a goal-kick.
16' Gibson and Chambers have flourished together this season and you can see why. Neither are physically imposing at first glance, but they both play with such an excellent mix of athleticism and tenacity, and they communicate so well. That's going to prove vital today against the nuisance that is Diego Costa.
14' First real sign of an opening there, for Chelsea, and it's Hazard who gets it with some clever play down the left. He has options in the centre, trying to square it for Pedro, but it's cut out smartly by Chambers who clears his lines convincingly.
12' Traore, who put in a remarkable showing at the Emirates a few weeks ago, is at it again here, dazzling the home fans and looking to channel his inner-Eden Hazard. Some lovely running down the right sees him win a free-kick, but the subsequent delivery from Ramirez is dealt with.
10' Chelsea have enjoyed plenty of possession through the opening 10 minutes, but have largely struggled to create. Boro remain well-organised in defence, and the Blues are quickly coming to see how the hosts have conceded just once in their last three games.
A. Clayton
Yellow Card
8' Middlesbrough players have quite clearly been instructed not to give Hazard any room to breathe. He's smothered by Boro players as he picks up the ball in midfield, with Clayton eventually conceding a free-kick and picking up a yellow card for an ill-timed sliding challenge.
7' STAT: Only two teams have collected fewer home points in the Premier League this season than Middlesbrough (4) - Swansea (2) and Sunderland (1).
5' Good determination from Fabio helps him win the ball and spring Ramirez down the left. The winger pulls it back for De Roon atop the area, and his shot is deflected into the path of Negredo, who lashes a half-volley across the face of goal, but no one is on hand to meet it at the far post!
3' Negredo's incessant running up top early on suggests Middlesbrough are certainly up for the occasion. The Riverside is a fun place to play and it's proving no different in these opening stages as a rowdy atmosphere greets the players from the off.
1' AND WE'RE OFF! Boro get us underway, in red, attacking right to left, with Chelsea in black.
Antonio Conte names an unchanged side for the fifth successive Premier League match, opting not to tamper with a winning formula. This XI has not conceded a goal over that span, scoring 14.
Two changes made by Aitor Karanka from the 0-0 draw at Manchester City. George Friend suffered a minor injury in training and is unavailable, replaced by Fabio, while Gaston Ramirez is back in the team after serving his one-match ban, pushing Stewart Downing to the bench.
SUBS: Begovic, Ivanovic, Fabregas, Oscar, Batshuayi, Terry, Chalobah.
CHELSEA (3-4-3): Courtois; Azpilicueta, Luiz, Cahill; Moses, Kante, Matic, Alonso; Pedro, Hazard, Costa.
SUBS: Espinosa, Leadbitter, Rhodes, Fischer, Guzan, Downing, Nsue.
MIDDLESBROUGH (4-5-1): Valdes; Barragan, Chambers, Gibson, Fabio; Traore, Forshaw, Clayton, De Roon, Ramirez; Negredo.
CONFIRMED TEAM NEWS:
Aitor Karanka’s side have plenty of resolve about them and have done really well to shore up the defensive issues that plagued them early in the season – now they need a bit of scoring consistency to follow.
Middlesbrough have a bit of their own momentum coming out of the international break, with a victory over Bournemouth sandwiched between draws away to Arsenal and Manchester City.
Without any European competition to worry about, Chelsea have been able to stay fresh and gather momentum which has seen them win five in a row after failing to claim victory in September.
Results went Chelsea’s way on Saturday with Liverpool settling for a draw at Southampton, meaning Antonio Conte’s men are poised to move to the top of the Premier League should they claim victory today.
Hello and welcome to live coverage from the Riverside Stadium as Chelsea aim to go top when they travel to take on a Middlesbrough side hoping to distance themselves from the bottom three!