FULL TIME. West Ham 3 Chelsea 1.
Torres' diving header is clawed away at the far post by Jaaskelainen and that is surely the last chance of the game.
Maiga, the man who has one for less than a minute capitalises on a Cech parry from Noble's shot and puts the icing on what will now be an incredible victory for the Hammers!
GOAL FOR WEST HAM - MAIGA!
Maiga comes on in place of Cole.
Four minutes of added time to be played.
Oscar gets in the way of Collins' clearance and a free-kick is given for handball, with Chelsea looking devoid of any hope of saving this match, such has been the fight back of West Ham.
Diame's silky skills allow him to skip through Cole, before Taylor wins West Ham another corner, with Chelsea looking completely shell shocked now.
It's a brilliant goal as Cole sets up Diame before the midflelder drives a fierce strike on goal which Cech reaches but can't keep out. It's 2-1 to West Ham and what a comeback this has been!
GOAL FOR WEST HAM - DIAME!
It's Oscar this time who attempts a thunderbolt, and it takes a touch off Collins, which should have resulted in a corner, but it's a West Ham goal kick.
Marin goes for goal after creating space neatly to let a show away, but Collins steps forward to put him off and he can only fire a weak shot straight into the arms of Jaaskelainen.
West Ham corner as Jarvis draws a fine save from Cech. Cole is then forced to clear off the line from Reid's header and the score remains level for now!
Diame hussles Ramires and forces play back with West Ham's shape really forcing Chelsea into playing killer passes through the centre with the Hammers easily intercept.
Torres tracks down the ball and finds Marin, but Ramires plays an uncharacteristically poor ball back out to Torres and it's a West Ham throw-in.
Moses is replaced and Marin takes to the field for Chelsea.
Oscar leads Chelsea forward, with Mata firing a venemous effort that is brilliantly charged down by O'Brien. This really has turned into a remarkable second half, with both teams certainly looking capable of netting a winner.
Nolan stretches to intercept Mata's pass, with Chelsea defending the corner superbly. Chelsea look to break moments later, but organised positioning from the Hammers derails the attack.
Ramires gets in a crucial clearing header as Taylor set himself to fire at goal, conceding a corner with the atmosphere deafening now at Upton Park.
Noble and Ramires battle, with the latter winning as Chelsea probe before O'Brien defends solidly against Oscar.
That's Hazard's last kick of the game as he is replaced by Oscar.
Hazard and Mata can't create an opening and the ball rolls to Jaaskelainen. A poor throw out though falls straight to Hazard, who goes for the lob which isn't too far from becoming an instant classic of a goal.
Top defending from Taylor, who prevents Moses reaching the byline, with the forward marked much tighter now due to his influence in the first half.
Mikel picks up a booking for apparent dissent.
Diame attempts the spectacular from range, but in the end it's quite a spectacularly poor effort that sails quite high over Cech's goal.
Jarvis can't retain West Ham's prolonged siege on Chelsea's goal, but the momentum seems to now be with the Hammers and the fans can sense it.
Azpilicueta is having a much tougher time against O'Brien and Jarvis now, the right-back clearing for the time being, but Cole regains possession before eventually being forced back.
Ramires concedes a corner, although he doesn't agree with the decision. Taylor crosses in but Torres is at the near post and powerfully heads the ball out of play.
Mata hits the post with a free-kick that incredibly then is fumbled away by a diving clearance from Collins as Torres loomed. Chelsea are really pushing for a response now.
Jaaskelainen makes an incredible double save, first from Hazard's long-range drive, and then from Torres at close range, the striker's effort far too tame in the end. What a game this is turning into now.
West Ham are level! Jarvis pressures Azpilicueta and his deflected delivery finds the head of Cole who nods the ball past Cech. Game on again.
GOAL FOR WEST HAM - COLE!
Taylor makes progress down the right, but his left footed delivery lands high and wide and Chelsea earn a momentary reprieve. It's been largely all West Ham since the break.
Mata's free-kick is cleared by Cole, but there's still danger as Moses plays in Mata on the overlap, who is marked well by Collins and it's a West Ham free-kick.
Cole and Mikel combine to win back possession, but space is far more limited in West Ham's half and the hosts end up regaining the ball quite easily.
Diame is tugged down by Moses, earning the striker a warning from the ref. Noble prepares to launch the free-kick into the box as the Hammers enjoy a good spell here.
A Noble corner sees Ivanovic head away, before the defender is called into action again, making a timely tackle on Cole who was lining up to shoot.
Cahill heads to the touchline after receiving treatment, and play resumes with a Chelsea goal kick. From there, Diame steps in and wins the ball off Mata as the Hammers' midfield becomes far more intent without possession.
Cahill goes in bravely to clear with his head from Nolan's shot and ends up taking a boot from Cole right to the face. Incredibly good defending from the centre-back but West Ham are much improved since the break.
Good movement again from Moses down the line, with Chelsea pressing in the final third before Nolan steps in, intercepting Hazard's though ball to Mata.
A second Hammers corner sees Cech infringed by Nolan, a decision the fans and players are fuming about, despite the keeper punching away impressively regardless.
This is better from West Ham, with Jarvis again influential as Cahill is forced to concede a corner. As a result, Diame fires a rocket at goal which ends up cannoning off the back of Cole.
Jarvis ventures forward from Nolan's sideways pass, and the winger's cross in to Cole is a good one, but the striker gets under the ball and directs his header over the bar.
Moses again displays wonderful skill to skip past Demel, firing a powerful ball across the face of goal with Collins able to stab away.
Torres strays offside from Mata's ball, although the flag is delayed and the striker is understandably frustrated as play is called back.
West Ham changes at the break - O'Neil and Tomkins come off with Taylor and Diame replacing them.
Juan Mata's goal, a wonderfully worked one from Chelsea, is the difference at the break. Can West Ham get back into this or is the game Chelsea's for the taking> Send your e-mails to firstname.lastname@example.org or tweet @JWoodfield365
HALF TIME. West Ham 0 Chelsea 1.
Collins' drive from the free-kick takes a couple of touches, with Nolan's header the decisive one as Cech is forced to parry the ball over the top for a corner.
Cech handles outside the area and it's a yellow card for the goalkeeper, who surely had no idea how far from his goal he actually was.
Ramires again plays a wonderful ball into Cole, but this time he is caught a yard offside by the linesman. The Brazilian is having a top game so far.
Ramires threads a sublime ball into Cole, but upon meeting it the full-back's ball to Torres is cut out by a timely challenge from Reid.
Chelsea are banging on the door, as Moses shows tremendous skill to work his way to the byline, finding Mata who this time is denied by an excellent Jaaskelainen save.
Nolan stretches to meet Noble's ball, but he slips and allows Ivanvovic in. The defender looks for Torres but he is well marshalled by Collins and the hosts regain possession.
Nolan earns West Ham a corner, after his ball into the box is blocked by Cole. From the delivery, Tomkins heads it back into the danger area but a throw-in is awarded as Ivanvovic hacks away.
Cech is called into action after Demel's ball from the right, and despite taking a clattering from Nolan, which sees the midfielder reprimanded by the referee, the goalkeeper gathers the ball expertly at the far post.
West Ham put the ball in the net, but the referee had blown his whistle beforehand for an apparent nudge on Ivanovic by Collins. A slightly harsh decision on the Hammers after what was a sublime finish by Nolan.
From the corner, Hazard is eventually found by Azpilicueta and aims a powerful effort at the top corner which is only narrowly over the bar. Chelsea really do look top drawer right now.
Azpilicueta heads forward once more, getting a good cross into the far post, where Demel, unaware of his surroundings, concedes a corner.
Chelsea look incredibly comfortable in possession, and for the time being West Ham are really struggling to fend them off, with Ramires' touch letting him down this time as he looked to shoot from 20 yards.
Mata slides the ball out wide to Azpilicueta, with his compatriot's ball into the box finding the run of Mata, whose first touch lets him down as Collins is presented with the chance to clear.
Demel's delivery lands at the feet of Mikel, and the midfielder sets Chelsea off on another threatening counter attack, before Torres again brings the move to an end with a poor knock on to Mata.
Moses fires a teasing ball across the face of goal, but all his team-mates are behind the ball and it ends up rolling out of play without a touch.
A West Ham attack sees Chelsea storm away, but after lovely work from Hazard, the winger finds Torres who blazes a poor right-footed strike over the bar.
Hazard searches for Torres, but plays a pacey ball over the top and Collins is quite comfortable as he ushers it out of play for a goal kick.
Chelsea corner as O'Brien gets in the way of Azpilicueta's delivery. Hazard's ball in ends up coming back to him, but Tomkins heads away with the ball still with Chelsea for the time being.
Mata is crowded out by Nolan and Noble, but upon winning back possession, Jarvis is beaten to the punch by Azpilicueta.
Great chance for 2-0. Ramires steals the ball from Demel and finds Moses, who flashes his effort wide of goal from 15 yards. Big let off there for the Hammers.
Noble isn't happy as he is penalised for a challenge on Mata. The free-kick is awarded though, with Mata crossing in as Jaaskelainen claims.
Noble loses out to Cahill, with this back four of Chelsea's looking quite formidable in the opening 20 minutes.
As the chants of "There's only one Di Matteo" break out from the away section, Chelsea control the ball well, with Mata at the heart of everything, before Collins gets in the way of his ball into Moses.
Azpilicueta heads away as Cole lurked down the touchline, with West Ham looking to find some rhythm with their passing which is ended by Mikel's tackle on Noble.
It's a lovely goal from Chelsea. Moses finds Torres with a wonderful pass, the striker pulling back to the arriving Mata who finishes calmly into the far corner. 1-0 to the Blues!
GOAL FOR CHELSEA - MATA!
Torres makes a surging run forward but is cut off by Collins. Good early intent from the striker though.
A Collins free-kick ends up catching Nolan offside after O'Neil's knockdown, in which Azpilicueta ending up making quite an impressive clearance.
Jarvis takes on Azpilicueta but the full-back does excellently to not only hold off the Hammers winger but prevent a corner being conceded.
Hazard whips a ball in but Moses is a yard behind Collins and the defender steps in. West Ham look to venture forward, but Cahill makes the challenge on Cole and the ball rolls back to Cech.
Cech punches away the delivery, and Chelsea pick up possession through Mikel. Hazard then looks to feed in Torres but Collins is well positioned to intercept.
Jarvis and Cole link up, with Tomkins getting involved before Azpilicueta is forced into a timely sliding tackle on Jarvis to concede a corner.
Demel crosses in from the right but it's quite a poor delivery that lands behind goal before any of his team-mates could arrive at the back post.
O'Neil switches play to O'Brien, but a dummy from Nolan allows Jarvis' pass to run on to Mikel as the West Ham attack breaks down.
A Chelsea corner comes to nothing as West Ham clear away, but the ball still lies with the visitors who knock the ball calmly around in their half.
West Ham kick off and get the game underway.
Paul Joao writes: "It has been a long time since we won, and a lot has happened lately. We lost our beloved Roberto Di Matteo, and got Rafa Benitez in his place, this affects players as they need to adapt to the new gaffer's tactics. However, the most important thing is we do have talent in squad, which might help us win the game today with a reorganized squad. We are lacking a bit of experience missing John Terry and Frank Lampard, and lack of real fire power upfront in the form of Daniel Sturridge, we should do well if Victor Moses starts. Torres is not going to help us we should sell him in January. I think Chelsea will win 1-0 or 2-1 today."
Nick Pring writes: "Glad to see Cahill back in the team. It would be nice to Marko Marin get some game time for once, however looks like a decent team selection. 3-1 to Chelsea today with Torres finally scoring 1 for Chels! Come on Blues!!!!"
Referee: Martin Atkinson (W Yorkshire).
West Ham: Jaaskelainen, Demel, Collins, Reid, O'Brien, Tomkins, Noble, O'Neil, Nolan, Jarvis, Cole. Subs: Spiegel, Taylor, Diame, Maiga, Spence, Fanimo, Moncur.
Here are the teams...
Robert Brown writes: "Hope Mata can make the kind of impact he made earlier this season! If he plays well I predict and 2-0 win for the Blues."
Chelsea are the well-backed favourites for today's early kick-off at 10/11 despite their drop in form with West Ham 3/1 and the draw 5/2.
Good afternoon everyone and welcome to Upton Park for live coverage of West Ham v Chelsea in the Premier League. Team news will be up shortly, if you'd like to get in touch today you can e-mail email@example.com or tweet @JWoodfield365
Kick-off is at 1245 GMT.