|Gabriel Alejandro Milito|
|Eric Abidal (Cabelino Andrade Maxwell, 53)|
|Xavier Hernandez Xavi|
|Krkic Perez Bojan (Yaya Toure, Y, 56)|
|Pedro Rodriguez Pedrito (Andres Iniesta, 86)|
|Mikael Silvestre (Emmanuel Eboue, 64)|
|Vassiriki Abou Diaby|
|Tomas Rosicky (Da Silva Eduardo, 73)|
|Pereira Neves Denilson|
Arsenal have the Premier League left in their sights but it will be interesting to see how they get on after this thumping loss.
Lionel Messi hits all four and his stock continues to rise. He is unplayable at the minute as Arsenal found out this evening.
BARCELONA 4-1 ARSENAL: That's it. Barcelona storm through to the next round following a first-half demolition act.
Eduardo heads over from the flag kick.
Eboue's run brings a corner. Can Arsenal grab a consolation?
An additional three minutes for Arsenal to endure. They have been comprehensively battered this evening by a far superior side.
BARCELONA 4-1 ARSENAL: MESSI grabs his fourth of the evening! The trickery and talent of the 22-year-old is there for all to see. His first effort is saved but as the ball breaks to him, he smashes through Almunia to put the icing on the cake.
Maxwell storms through and almost sneaks his effort inside Almunia's near post. But the keeper reacts just in time to stop the Spaniards from extending their lead.
Andres Iniesta comes on for the impressive Pedro ahead of their huge game with Real Madrid at the weekend.
The Barca fans are in full voice now as they hold the ball majestically.
Walcott smashes the ball against the frame of the goal but he is offside.
Sagna just does enough to stop Messi going one-on-one with Almunia.
Fabulous turn from Pedro on the edge of the box fools Diaby, Eboue and Sagna but he puts his shot wide. Great play from the wide man.
The corner is a poor one and Arsenal break. But yet again fine defending and pressure from Barca halts any danger.
Alves' cross is deflected for a corner. Can the hosts add the gloss to a fine performance with a fourth here?
Clichy's bursts clear but fires an effort high and wide.
Barca look content to see this one out.
Eduardo enters the fray at the expense Rosicky. The Czech Republic man has been somewhat disappointing tonight.
Bendtner heads Clichy's fabulous cross onto the post but he is flagged offside.
A quick free-kick sees Pedro clear on goal but his chip drifts just wide.
Rosicky is picked out on the edge of the area but the midfielder shoots over. These half chances have to be taken if they are to force the issue.
Eboue goes into the book for raising his hand and connecting with Busquets as he bombs up the right wing.
There is no real intensity from either side at the moment. Arsenal are doing very little to look like getting back into this one.
First Arsenal change as Emmanuel Eboue comes on for Silvestre.
A promising Arsenal move breaks down as Clichy's wild effort from distance sails wide.
Big chance for Arsenal as the ball breaks to Bendtner. However, he is slow to react and Milito makes a great last-ditch challenge.
Clichy provides a meaningful run up the left but he is tackled and the ball runs away for a throw.
The Barca faithful are whistling as Arsenal keep hold of the ball. The visitors are doing nothing to hurt their opponents though.
Has Guardiola now got one eye on the weeked showdown with La Liga rivals Real Madrid?
Yaya Toure is the next to be brought on as Bojan is replaced.
Pedro breaks on the right but can't find Messi.
Fine play from Messi, Alves and Bojan ends with the latter shooting wide from the edge of the area.
The injured Abidal is replaced by Maxwell as Josep Guardiola makes his first change.
A break in proceedings here as Abidal is grounded. Could be his troublesome thigh problem.
Fantastic entertainment from the Champions League holders.
Xavi's dart through the centre is thwarted by Vermaelen.
Alves breaks up the right flank but his cross doesn't find Messi or Bojan and Arsenal survive.
Messi is a matter of inches from grabbing his fourth as Pedro's telling centre is just too far ahead of his despairing slide.
Good pressure from Barca's midfield men. They are swamping the centre of the park, with or without the ball.
No changes for Arsenal as they look to get back into the contest.
The referee blows his whistle and the Gunners get the second-half under way.
BARCELONA 3-1 ARSENAL: What an opening 45 minutes of football. After Bendtner's opener, Lionel Messi has put on a feast, scoring a well-executed 21 minute hat-trick. Ominous signs for the Gunners.
Messi's clever flick almsot plays in Bojan but the Arsenal defence holds out.
The fourth official indicates there will be a minimum of one additional minute at the end of this absorbing first-half.
Rosicky goes into the book for a lunge of Marquez.
For once Messi's control lets him down as he homes in on goal. His heavy touch allows Almunia to dive out at his feet to claim the ball.
BARCELONA 3-1 ARSENAL: MESSI gets his hat-trick! He is played clean through on goal and, as Almunia advances, he deftly scoops the ball over him. Audacious and spectacular. Unbelievable stuff. His fourth hat-trick of 2010 so far. Incredible!
Marquez and Milito are looking assured at the heart of Barcelona's defence, unfortunately for Arsenal.
Plenty of keep ball again from Barca. Another goal would kill off Arsenal now.
BARCELONA 2-1 ARSENAL: MESSI at the double. What a player he is. He starts the move and ends it as he feeds Eric Abidal on the left-wing. His ball is almost cleared but Messi's clever touch opens the chance and he lifts the ball over Almunia.
Alves' excellent cross is cleared in the nick of time by Vermaelen as Bojan was ready to pounce.
Nasri brings down Xavi as Barca turn the screw.
Bendtner is in the clear but the linesman's flag saves Barca. Close call.
Messi teases Silvestre as he faces the French defender one-on-one. But the front man fires his shot into the side netting, much to the visitors' relief.
Alves hits the free-kick from distance but it is gathered by Almunia.
Messi goes down under a strong challenge from Denilson as the midfielder wins the ball. However, Stark brings out the yellow card for the first time this evening.
Referee Wolfgang Stark blows up against Busquets as he brings down Walcott. Again, that should have been a caution.
Lots of Barca possession but it's not causing Arsenal any problems at the moment.
Pedro breaks with menace but his cross is poor, much to the frustration of Barca's troops who bombed forward.
The game has entered a slight lull after an explosive few minutes. Arsenal have re-grouped after that setback and look confident on the ball.
Gael Clichy's centre is deflected behind off Alves. The corner is flicked on by Vermaelen but the attack comes to nothing.
Thomas Vermaelen is penalised for a challenge on Bojan. Arsenal manage to clear the ball to safety.
BARCELONA 1-1 ARSENAL: MESSI smashes home! The world-class star fires beyond Almunia from the edge of the box as Arsenal fail to clear their lines. Great few minutes here.
Poor play from Diaby. The towering midfielder should have released Walcott but he delayed his pass, enabling Barca to clear.
BARCELONA 0-1 ARSENAL: BENDTNER scores! Walcott beats the offside trap and his pass finds Bendtner. His first effort is saved by Victor Valdes but he reacts well to put the rebound home. What a start for the Gunners.
Denilson is lucky to escape a booking as he brings down Busquets.
Nasri's back into the action just as Bacary Sagna gives away a free-kick on the left-wing.
That challenge has hurt Nasri and the diminutive midfielder is one the ground. Arsene Wenger could do without any further injury blows.
Crunching tackle from Milito on Samir Nasri stirs the crowd.
Fine break from Messi and Dani Alves sees an attacking move unfold but the Gunners clear.
Messi picks up a loose ball and his curling left-footed effort goes narrowly over the bar. Great effort.
Bojan's clever pass finds Pedro Pedrito but his weak effort from the edge of the box is screwed wide.
Much better from Arsenal. They are putting pressure on the ball and it is forcing Barca's defence into mistakes.
The instrumental Xavi is playing very deep in the opening minutes here and he is clattered by Abou Diaby. That hurt the Spain international.
The corner is cleared and a free-kick is awarded to the Gunners as Walcott is tripped.
Messi's fizzing effort is tipped wide for a corner from Manuel Almunia. Promising start from the hosts.
Xavi's cheeky back-heel goes wide from a left-wing centre.
A quieter start in comparison to last week's meeting. Barca are keeping the ball well and it's been a sedate opening.
Barcelona get the game up and running.
Nicklas Bendtner will be Arsenal's chief goal threat this evening and he must take any chances against Barca's makeshift defence.
The two teams make their way onto the pitch and the magnificent Camp Nou is packed for this one. Can Arsenal's patched up starting 11 cope with the threat of Lionel Messi, Sergio Busquets, Xavi and company?
Meanwhile, Barca or Arsenal will take on Internazionale in the last-four after the Italians beat CSKA Moscow 1-0 in Russia earlier this evening, securing a 2-0 aggregate win. Wesley Sneijder scoring the only goal early in the contest.
So Arsenal must score to stand any chance of progressing and Barca, minus Ibrahimovic, have called on youngster Krkic Bojan. It promises to be a fantastic occasion in Spain tonight.
The Gunners' injured quartet are replaced by Tomas Rosicky, Mikael Silvestre, Denilson and Theo Walcott, who made a telling contribution in the first leg last week.
Captain Carles Puyol and Gerard Pique miss out through suspension so in come Rafael Marquez and Gabriel Alejandro Milito. Arsenal must look to exploit Barca's new-look defensive unit if they are to progress to this season's semi-final stage.
Zlatan Ibrahimovic, who scored both Barca goals last week in the first leg 2-2 draw, is missing and is replaced by Krkic Bojan and talisman Andres Iniesta is on the bench for the clash after his own injury problem.
Arsenal are without Cesc Fabregas, William Gallas, Andrey Arshavin and Alex Song through injury to make their task that bit harder.
Good evening and welcome to this pivotal Champions League quarter-final second leg clash between Barcelona and Arsenal from Camp Nou.
Barcelona face Arsenal at 7:45pm on Tuesday, April 6th.
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