And that's your lot. United came flying out of the traps and led 2-0 after just 11 minutes but rather lost their way afterwards and can have no complaints at having to do it all over again at Stamford Bridge. Rafael Benitez was jeered by the Chelsea fans as he made a double substitution in the second half but one of those he introduced - Hazard - sparked the comeback and Ramires secured the replay for the Blues.
Oscar's corner is diverted to Hazard by someone at the front post - not clear who - but the Belgian's shot is easy for De Gea.
Hazard's drilled shot is palmed away by De Gea, Evans slides it straight to Cole but he can't get it out of his feet and has to settle for a corner.
Throw comes to nothing and Chelsea spring on the counter. Oscar slides it to Torres but his shot is easy for De Gea.
Late throw for United deep in Chelsea territory.
Carrick caught on the ball in his own half by a combination of Mata and Torres - but it's only because the latter has impeded him.
We're into four minutes of added time.
Evra carries it out but Luiz outmuscles van Persie and carries it forward. He picks out Mata with a brilliant ball and the Spaniard takes it down onto his left and looks set to clip it into the corner when De Gea thrusts out a leg to push it away for a corner. Brilliant save. That was game over otherwise.
Ramires tries to wriggle clear on the edge of the United box but can't do so. Again the hosts clearly poorly, though. They can't get out.
Carrick slides it to the advancing Valencia but his attempted ball to van Persie sails behind for a goal-kick. Poor.
Corner comes to nothing and Mikel then gifts possession to Carrick as Chelsea look to press.
Mata's reverse ball to Torres allows him to get a shot away but Evans is with him every step of the way and it deflects behind for a corner.
Great tackle from Carrick on Oscar centrally wins the ball back after a decent spell of United possession falters on the edge of the box. Comes to nothing, though.
Van Persie tries to link with Welbeck on halfway but United just can't get it going.
Mikel does well to get the ball down in central midfield. Chelsea push forward and Mata - now back on, obviously - fires in a right-footed shot which De Gea gathers easily.
Just caught a quick replay and looks like Mata rolled his ankle as he turned inside Ferdinand. He's back to his feet and hobbling but will obviously be keen to continue.
Evans and Ferdinand combine to clear Mata's cross from the right but Chelsea just keep coming and coming. This time Mata turns inside Ferdinand and goes down in a heap. As the ball is cleared, van Persie is pulled up for a high foot and Mata is still down. He'll need treatment.
You can sense the tension among the home fans here - they are not enjoying this one but.
Ball whipped in from the United left but van Persie is penalised for a nudge on Luiz centrally.
Hazard and Mata look to link up in the United box but it doesn't come off - just - and United are able to clear eventually. United break on the counter and van Persie's shot is deflected. Looks to be heading for a corner when a Superman effort from Cech allows him to slap it out for a throw.
Hazard picks off De Gea's pass out to Evra and slides it across looking for Torres but Carrick reads the danger and clears.
Ba leaves the action, with Fernando Torres on in his place.
Bit of pinball in the Chelsea box from the corner before the ball drops to Cleverley but his shot sails into the crowd.
Rooney's free-kick is half-cleared by Luiz. As the ball is whipped back in Van Persie drills a shot in which is deflected behind for a corner.
That's Kagawa's last act - Danny Welbeck replaces him.
Lovely spin from Kagawa and one-two between him and Rooney but Chelsea clear Kagawa's cross only for Hazard to jump into Cleverley and go into the book. Free-kick United.
Valencia and Carrick link up down the right but the latter's ball across for Rooney is hacked clear by a sliding Luiz.
Van Persie has to drop into his own half to get on the ball - a sign of how much United are struggling at the moment.
Wonder what those Chelsea fans who were jeering Benitez after the substitutions think now? Hazard has run the game since he's come on.
Rooney whips the ball in from the left but Luiz does really well to head the ball away from van Persie. As it drops, Cleverley blocks Ramires' progress illegally. Free-kick Chelsea.
As strange as it may sound given they led 2-0 after 11 minutes, United have struggled for rhythm and tempo pretty much throughout this one and as I say can have no complaints that Chelsea are level.
GOAL - RAMIRES. It's level - and United can have no complaints. After a Luiz interception, Ba breaks forward and helps get the ball worked out to Ramires. He cuts back in on his left foot and curls home. De Gea got fingertips to it but couldn't keep out.
Decent ball whipped in by Valencia from the right but Cahill heads clear under pressure from van Persie.
Finally a spell of possession for United. Doesn't last long, though, as Valencia turns into trouble and then can't find Rafael with a lofted ball forward down the right.
Chelsea knocking the ball around at will trying to tease United away from their 18-yard line, which is where the defensive four have taken up residence of late.
United struggling to retain possession here. Could have no complaints if Chelsea found a second as they're right on the back foot.
Looks like Rooney has been pushed out to the left as a result of the change, with Kagawa dropping into the hole between van Persie.
Looked like Ashley Young was going to come on there for a while but as it is Robin van Persie replaces Hernandez.
Hazard curls another one in from the left but this time it's a cross that's too heavy for Ba and De Gea comes to gather unchallenged. United lacking any rhythm at the moment.
Chelsea have deserved that. United offering little going forward at the moment and were penned in for a good while before Hazard finally made the breakthrough.
GOAL - HAZARD. Chelsea right back in it - and it's the substitute who scores it. Mata slides the ball out to Hazard towards the left-hand side and he curls a peach of a shot home from exactly 18 yards out. Lovely finish.
Luiz curls a shot in from distance after that good spell of Chelsea pressure but De Gea gathers at the second attempt after palming the initial shot away pretty comfortably.
Hazard seeing plenty of the ball as Chelsea probe for an opening but they're struggling to break down United's backline.
Plenty of nice build-up play from Chelsea but Ba can't spin away from Ferdinand and the defender pokes a toe out to clear.
Luiz is the second player cautioned as he slides in and brings Rafael down as the full-back looks to burst down the right.
Hazard drifts a cross in from the right but Evans heads clear. Bit slack from United initially but eventually Rooney intervenes and looks to link up with Valencia down the right.
Kagawa tries a slide-rule ball through to Hernandez but it's inches away from the Mexican's toes. Think the offside flag would have been up had he latched onto it anyway.
John Obi Mikel replaces Lampard while Eden Hazard is on for Moses in a double change from Rafael Benitez. Fair to say the away fans haven't taken that one too well - 'You don't know what you're doing' clearly audible from the visiting supporters.
Mata escapes Cleverley's attentions then benefits from a complete air kick from Evans. United get back in numbers but the ball breaks to Ramires. He powers to the edge of the United box but his left-footed shot is always going wide of goal.
Cleverley nearly - luckily - bursts onto the ball in the United box after mistiming a pass but Cahill comes across to hack it out.
Valencia jinks away from Cole but his cross strikes Luiz in the shins and flies clear. United have to be content with a throw when the ball is worked back to the winger.
The throw-in comes to nothing but it just underlines things look a bit uncertain at the back for Chelsea.
Poor from Cole as he manages to slide the ball straight out for a throw-in to United deep in Chelsea territory. Immediatley apologises but that was very, very slack.
Valencia tries to thread a ball through for Rafael and nearly succeeds only for Luiz to get across and clear.
Chelsea straight on the attack down the right and Mata whips a cross in. Ferdinand heads it up in the air and Rafael completes the clearance.
Chelsea get us back under way.
On the other side of the fence, Ben writes: "Great start by United, Chelsea playing well towards the end of the half, but United look like scoring with every attack could be 3 or 4 nil."
Nigel Baldwin is not a happy chappy. He writes: "Only 2-0 at half-time...have to say that is better than I expected. The only hope we (Chelsea) have now, is if Benitez doesn't come out for the second half! Surely to God he has got be gone tonight, as he can't stay after YET ANOTHER disastrous performance...can he!!??"
Fancy a bet to keep the interest up in the second half? United are now 1/16 shots with the draw 10/1 and Chelsea now out at 33/1. It's 16/1 Wayne Rooney scores next and United win 3-0, while it's 22/1 for Demba Ba to score next in a 2-2 draw.
Valencia at least gets a touch as he helps United force a corner down the right, but they don't get time to take it as the half-time whistle blows. Clinical start from United and Chelsea have it all to do. Their general play has been good since falling 2-0 behind but they're yet to really extend De Gea.
Rooney attempts an audacious curling chip from 25 yards but it drifts just over the bar. Cech was backpedalling but think he'd have had it covered had it dropped below the bar.
Rafael forces a throw down the right, which allows Valencia to enter the fray in place of Nani. He'll be on for all of 25 seconds before the half-time whistle blows.
With the physio on to treat him, Nani hobbles to the touchline as we enter two minutes of added time. Indeed he's straight down the tunnel. Antonio Valencia will replace him shortly...
Nani down in the D outside the Chelsea area. Not entirely sure what happened there but once I know, you will.
Cahill turns into trouble and his clearance is straight to Carrick. United push forward again but have to settle for a throw down the right.
Patient probing from United ends as Cleverley's attempted cross from the left is blocked virtually at source by Moses. Chelsea spring quickly on the counter but Ba's angled shot from the right is blocked by Ferdinand.
Nani's cross from the right is blocked by Luiz but the Portuguese does really well to react quickest and nick the ball away from Cole to keep United in possession.
A rare United break sees Rooney try to find Nani with an ambitious ball out to the right. It's taken by Cole but the officials have spotted Azpilicueta preventing Kagawa from making a run down the left and he's the first player into the book, with United getting the free-kick.
Cole curls a cross in from the left but Evra eases Moses away from it and the ball skips out to the right where Azpilicueta sends it back across. The ball flies across the goalmouth but away from danger.
Evra is caught in possession inside the United half, allowing Moses and Mata to link well. The former breaks into the United box from the right but his left-footed shot is frankly awful.
Oscar jinks past Rafael cleverly but delays the cross and the ball ends up sliding out of play for a goal-kick.
Free-kick is poor and Chelsea look to break but once again the United central defenders are alert to the danger.
Ramires gets a ticking-off - and what looks to be a final warning - after fouling Kagawa just inside the Chelsea half.
Chelsea work another crossing opportunity down the right - they've done that part of the game well so far - but Moses' ball is blocked out for a throw by the backtracking Carrick.
Rooney this time comes off second best in a challenge with Luiz but without the need for the ball to be put out he's quickly back to his feet.
Oscar feels he's impeded out on the Chelsea left but referee Webb waves play on and United carry it clear.
Hernandez and Luiz tangle as they challenge for the ball with the Mexican coming off second best. Play continues initially and then Chelsea slide it out. Just after they do so, Hernandez clambers back to his feet so United simply return the ball to Chelsea. Waste of time.
Moses this time crosses from the right but Ferdinand heads clear. Excellent clearance that with Ba well placed behind him.
Azpilicueta's latest cross from the right is headed clear by a diving Evans.
Rooney just allows the ball to squirm away from his control and Mata holds firm in the challenge of the No 10s to carry it clear.
Hernandez thinks he's been fouled by Ramires but Webb waves play on. Ba breaks on the counter but opts for an over-ambitious shot which is all too easy for De Gea to gather.
United happy with a bit of possession football.
Good defending from Ferdinand once again as he forces a goal-kick for United when he looked to be in a sticky spot for a moment.
Just as I write that Cahill comes forward and thunders a long-range shot in but it's always sailing high and wide of De Gea's left-hand post.
Corner comes to nothing but that's better from United. They'd got a bit slack after their flying start but looks like they're back on it now.
Nearly 3-0. Evra slides a lovely ball in which the unmarked Rooney turns goalwards. Cech pushes it away and an instinctive if off-target header from Luiz - attempting to concede a corner - then forces him to leap up and turn the ball behind.
Nani curls a cross in from the right and Hernandez manages to fashion an attempt with his left foot as the ball comes across him but he can never get a cute enough touch on it from that angle and it sails into the Stretford End.
Caroline Schiffer writes: "Turning out to be a good match. As a lifelong Man U fan and my brother Andy being a Chelsea fan you can imagine the tension. Of course Man U will win, gonna enjoy rubbing it in!"
Slack play from United enables Mata to scythe forward and slide it to Lampard but his shot is comfortable for De Gea.
Lampard works the ball out to Azpilicueta down the right but his ball is really poor. Rafael misses his kick but Nani tidies up behind him and United clear the danger.
Luiz knocks the ball long towards Ba. Ferdinand heads clear but then it finds its way to Moses. He smashes in a shot which strikes Evans and the Northern Ireland defender does excellently to race out to the left-back position, keep the ball in and clear.
Ashley Cole drills a cross in from the left but it strikes Ferdinand and he completes the clearance as the ball bounces towards the byline.
Moses not happy as a throw-in goes United's way as he and Evra battle for the ball...but he's soon happy again as referee Webb overrules the assistant on the near side.
Ba gets a flick to a cross from the left but Patrice Evra is alert to the danger posed by Moses behind him and crouches to head clear.
Once again, United happy to drop deep for now and invite Chelsea to find a way through.
Mata's free-kick curls into the United box but Rio Ferdinand climbs highest to head clear. Dominant defending.
Good football from Chelsea as they knock the ball around confidently and as Oscar tries to flick it around Cleverley the United man uses his left arm to block the ball. Free-kick to Chelsea and Mata may look to emulate Rooney here, albeit from a slightly different angle.
Absolute classic free-kick from that position - the taker knows if they whip it across any touch and it's probably a goal while the goalkeeper is on alert for such a touch and if it's on target and no-one touches it there's every chance it'll find the net on its own.
GOAL - ROONEY. Don't like to say 'I told you so...' but Rooney curls the free-kick in and it curls straight past the gaggle of bodies in the middle and into the corner. Luiz and Jonny Evans went up for it but don't think either connected.
The corner comes to nothing and United look to break quickly on the counter. Nani bursts down the left and is tripped by Victor Moses. Free-kick to United in a dangerous position. Rooney can whip this one across.
Azpilicueta drifts a cross over from the right which Ba heads down. Rafael gets a half-clearance to it but Lampard's first shot is blocked then Oscar's follow-up squirts behind for a corner.
Chelsea force a throw deep in United territory.
United happy to just knock the ball around and draw Chelsea onto them. Understandable at the moment given the way they've started.
Struggling to put into words the quality of that ball from Carrick. Looked to be shaping to knock it out to Nani on the right but found Hernandez perfectly with a reverse ball.
GOAL - HERNANDEZ. That didn't take long. Lovely lofted and angled ball from Carrick floats perfectly onto the head of Hernandez, who loops his header beyond Petr Cech and into the far corner. He loves playing against Chelsea.
Luiz again has to get across to the Chelsea left to knock the ball out for a throw as Nani looks to link up with Rooney this time.
Rooney dropping off Hernandez in the early stages. Looks desperate to get involved for obvious reasons.
Nani and Rafael link up down the right to good effect, the former causing David Luiz to turn the ball out for a throw deep in Chelsea territory.
Demba Ba momentarily looks to have spun Rio Ferdinand to advance towards the United goal but he's done so illegally. Free-kick to the Red Devils.
Manchester United get the game under way, kicking towards the Stretford End.
Referee Howard Webb leads the teams out onto the field.
The teams are in the tunnel.
Toby Day writes: "Hi, supporting CHELSEA today as always! My prediction is 3-2 to CHELSEA! Would be awesome for TORRES to go on with BA but oh well."
Marc Jones writes: "Glad to see Rooney starting for United today. Good strong side there by Ferguson. 4-1 United - Rooney with two of them."
Duncan writes: "How on earth can Benitez not pick Terry for a game like this? Fearing a hammering and Hernandez to score against us as usual. The team is so lacklustre under this manager."
My namesake Reece Robinson writes: "Fancy Chelsea to snatch this 1-0 through a Frank Lampard penalty. Would have liked to see Hazard start."
Daniel James not a confident Chelsea fan. He writes: "Oh dear, being a Chelsea fan I can sadly admit we are doomed. Hernandez knows how to open us up, I can see him scoring 2..."
Have just added the subs into the Chelsea line-up for those interested - Terry and Torres both there.
Just finished in the third of the weekend's FA Cup quarter-finals and it'll be 'Millwall or Blackburn' in the semi-final draw later after a 0-0 draw at the New Den.
Daniel Rose writes: "Fully expect to see United win today and Rooney to have a stormer, Chicharito will score his obligatory goal against Chelsea too, United to win 3-1."
Kane writes: "As a Chelsea fan I'm expecting a Lampard penalty to be crucial in the tie today to take his goal tally to 200. I'm feeling goal 202 to come against West Ham next week to break the record. COME ON CHELSEA!"
Ben writes: "I think it will be a close game today. Chelsea not in the best form but can perform on occasion. I say 2-1 United."
If you fancy a bet on the game, our friends at Sky Bet go 3/4 the Manchester United win with Chelsea out at 100/30 and the draw an 11/4 chance. Wayne Rooney was boosted to 6/1 earlier in the week to score first - he's now 11/2. From the Chelsea side, Oscar has been boosted to 14/1 for the first goal.
Chelsea: Cech, Azpilicueta, Luiz, Cahill, Cole, Ramires, Lampard, Mata, Oscar, Moses, Ba. Subs: Turnbull, Ivanovic, Terry, Bertrand, Mikel, Hazard, Torres.
Manchester United: De Gea, Rafael, Ferdinand, Evans, Evra, Nani, Carrick, Cleverley, Kagawa, Rooney, Hernandez. Subs: Amos, van Persie, Valencia, Anderson, Vidic, Young, Welbeck.
Don't have the full teamlists to hand just yet but I can tell you we're hearing Wayne Rooney and Javier Hernandez are paired together up front for United, with Robin van Persie on the bench.
If you want to get involved let me know your thoughts with an email to firstname.lastname@example.org and as and when time allows I'll post some up.
Good afternoon and welcome to our coverage of the last of the four FA Cup quarter-finals. Manchester City and Wigan are already through to the semi-finals while Millwall and Blackburn are currently drawing 0-0 with around 15 minutes left.