Last Updated: 28/12/14 6:22pm
And referee Swarbrick brings an end to an excellent clash in East London, the Hammers threw everything at Szczesny and co at the end, but Arsenal were somehow able to hang on for a vital three points.
Adrian up again as Song floats it in, Szczesny comes for it and doesn't get near it as Carroll heads to the far post. A flurry from some Hammers players desperately try to put it in but Valencia's eventual header flies over the bar.
Monreal writhing in pain after picking up a knock, but the referee says nothing doing and allows the Hammers to play on.
Desperate defending from Arsenal asd West Ham continue to put their centre-backs under pressure, relentlessly lofting balls into the box.
A fierce effort from Nolan from the edge of the area is right at Szczesny, who does well to hang on.
A woeful cross from Kouyate files behind the goal, reliev all the pressure on the Arsenal back four and allowing Szczesny to milk the clock somewhat.
A fine run from Oxlade-Chamberlain sees him blow past his marker Cresswell, only to fire wide of the target.
West Ham firing a number of crosses in but the Arsenal defence seems to be standing firm at the moment.
Valencia draws a foul on Debuchy allowing for another ball into the box, which Szczesny claims well once again.
The game being played at a frenetic pace as Arsenal break once more, but once again they are unable to find the finish to match the build up as Cazorla fires over.
Welbeck nicks the ball off Song and hones in on goal only to smash his effort high and wide, when he really should of scored.
Adrain with another tremendous save as Sanchez drifts past several West Ham defenders and fires a low toe-poke to the near post.
A great save by Adrian denies Arsenal a third after Oxlade-Chamberlain beat Creswell to latch onto Sanchez's excellent cross into the area.
Corner to West Ham now as Debuchy does enough to put the ball out of play, with several Hammers lurking.
The referee plays a good advantage after a foul on Carroll but Amalfitano can't make the most of it as he blasts his effort from the edge of the area over Szczesny's goal.
Downing flagged for offside after he looked to be clear on goal, although replays suggest the former Liverpool man was level with the last man Koscielny.
Cazorla plays in Sanchez as Arsenal break once more but the West Ham defence is once again on hand to block the Chilean's effort.
A superb run from Welbeck down the left earns some much needed respite and his effort at the end of it nearly gets the better of Adrian, who manages to tip it wide.
Downing floats in a lofted ball that is too close to Szczesny, but the Pole gifts it straight back with a woeful piece of distribution.
West Ham really upping the pressure now but the Gunners' defence seems to have shored up somewhat following a shaky start to the half.
The game really opening up now, a fine inswinging cross from Kouyate is just too far ahead of his compatriot Sakho, who managed to break free of Koscienly.
Debuchy comes awfully close from the resulting corner as he heads Cazorla's ball in just over the bar.
Cazorla nearly gets the goal straight back for the Gunners with a fierce strike from the edge of the area after another great driving run from Oxlade-Chamberlain.
Goal! West Ham right back in it now as Kouyate heads home for his first Hammers goal following a great lofted cross from Tomkins. Perfect start to the second-half for Sam Allardyce.
Song wins a throw off Welbeck, which allows Allardyce's men to mount another attack on the Arsenal goal. But a poor throw in from Amalfitano gifts possession back to the Gunners.
William Roberts: Loving the lead at the break, I reckon the Hammers will get a goal back but we will hold them for the last minutes- like we always do these days!!
Creswell puts too much on his curling pass down the left as he tries to find Sakho and the ball goes out for a goal-kick.
Welbeck does well to evade his marker and tries to find Coquelin, who is impeded by the referee which is met with cheers and groans by the respective supporters inside the ground.
And the referee blows his whistle to bring an end to a frantic final couple of minutes, Arsenal producing a smash and grab to go into the break 2-0 up. Join us after the interval for the second-half.
Arsenal piling on the pressure now as Sanchez picks up the loose ball and fires into a West Ham defender which results in another corner.
Goal! And theyv'e scored again! Some excellent interplay by Cazorla and Oxlade-Chamberlain sees the winger reach the by-line and fire in a great cross, which his England teammate Welbeck taps home.
Goal! The Gunners take the lead as Cazorla sends Adrian the wrong way and puts it in the bottom left-corner. 1-0 to Arsenal.
A brilliant ball over the top from Downing finds Tomkins in acres of space in the area, but the defender's finish leaves much to be desired as his side-footed effort flies harmlessly over the bar.
A stricken Debuchy still receiving treatment, the Hammers fans giving him some stick as he makes his way off the pitch.
Carroll receives the first booking of the game for a foul on Debuchy, although replays suggest the Frenchman made a meal of it.
A deft little dink from Oxlade-Chamberlain nearly finds Sanchez at the far post but for an excellent intervention by Adrian, who gets West Ham back on the front foot with a quick throw out.
Arsenal push it up the other end but Sanchez uncharacteristically puts it out for a throw, though he believes it cam off O'Brien.
Koscielny puts it out for a corner after Amalfitano went past Monreal like he wasn't there.Szczesny clears the danger with a solid punch.
Cresswell and Downing combining well down the left hand side for Allardyce's men, but so far neither of them have been able to get the better of Debuchy.
Relentless closing down from Sanchez almost sees him catch Adrian in possession, but the Hammers keeper just manages to clear.
A good spell of pressure now for Arsenal, but West Ham gain some respite after Debuchy is flagged for offside.
Sanchez in the thick of it again, this time down the left but his measured effort is deflected out for a corner.
Sanchez does well to evade numerous challenges and find Oxlade-Chamberlain, but the England winger is shrugged off by Song and fouls the Senegalese. Another Hammers free-kick.
Carroll completely out muscles Debuchy at the far post from the free-kick and fires a fierce volley across goal, which is somehow cleared for a corner by the Arsenal defence.
Coquelin leaves his leg in on Downing to which the referee awards a free-kick, despite the Frenchman winning the ball.
A poor giveaway by Mertesacker allows Kouyate to run at the Arsenal defence, but the ,midfielder's effort is far too tame to trouble Szczesny.
A exceelnt ball from Downing finds Cresswell unmarked down the right, but the fullback's cross is too close to Szczesny, who gathers comfrtably.
Goal-kick for West Ham after a poor attempt by Koscielny, Adrian fumes at the linesman as at least four Gunners looked offside.
A fine run from Welbeck results in an Arsenal free-kick as former Gunner Song clips his heels. Cazorla to deliver.
Sakho in the wars again, this time he is brought down by a poor challenge from behind by Monreal. The Gunners comfortably deal with the resulting ball in from Tomkins.
A good challenge from Coquelin allows Arsenal to break, but the Hammers defence does well to dispposses Oxlade-Chamberlain on the edge of the area.
a perfectly weighted ball through by Cazorla finds Sanchez in the box, but the Chilean is thwarted by a no nonsense tackle by Winston Reid in the area.
A crucial interception by O'Brien on the edge of the area prevents Sanchez closing in on goal after a blistering counter-attack from the Gunners, end to end stuff early on at Upton Park.
Calls for a penalty are waved away from the referee as Debuchy bundles over Sakho in the area, great ball in from Amalfitano down the right.
Mass confusion in the ground as Song rifles a venomous volley into the back of the net only for the linesman to flag for offside, presumably for offside on one of the Hammers players in Szczesny way.
Some poor communication from the Arsenal back four sees Monreal head the ball out for a corner, though it comes for nil as Szczesny claims comfortably.
Anticipation building ahead of kick-off as the players make their way out onto the Upton Park pitch with the Hammers fans doing their best rendition of 'I'm Forever Blowing Bubbles'.
Darren Hinchley is a bit more optimistic on the inclusion of Coquelin: Smart move by playing Coquelin. Will give us extra bite in midfield. In response to Kevin Pratt. I think playing Flamini and Coquelin together will give us better stability going forward.
Kevin Pratt reckons the Gunners will be lucky to get a point at Upton Park: Odd choices from Wenger there! Arsenal fan here hoping for a point if Coquelin is playing!
Terry Fisher is backing his Hammers to end their recent slump against Arsenal today, he says: Attacking game today the Hammers will come out on top, 2-1 to the Irons. COYI !!!
Arsenal XI: Szczesny, Debuchy, Mertesacker, Koscielny, Monreal, Coquelin, Flamini, Oxlade-Chamberlain, Sanchez, Cazorla, Welbeck.
West Ham XI: Adrian, Reid, Cresswell, Tomkins, Kouyate, Song, Downing, Sakho, O'Brien, Amalfitano, Carroll.
Welcome to Upton Park where West Ham host Arsenal in today's Premier League clash. Can The Hammers bounce back from their Boxing Day loss to Chelsea or will the Gunners continue their impressive record against their London rivals.? Send your views / predictions for today's game to firstname.lastname@example.org and I will post up the best throughout the afternoon.