FT: Arsenal 4-1 West Ham. A late blitz from Arsenal secures victory as the hosts bag three in seven minutes late on. Nacho Monreal opened the scoring, only for Marko Arnautovic to peg the hosts back, before Aaron Ramsey and Alexandre Lacazette (2) secured the points for Arsenal.
It should be five! Lacazette shows quick feet in the box to retain possession an drop the ball off for Xhaka but he blazes over under no pressure whatsoever.
GOAL! ARSENAL! LACAZETTE! Ramsey dances his way to the byline down the left before pulling the ball back for Lacazette and he lets the ball run across him before firing low past Hart for his second of the game.
GOAL! ARSENAL! LACAZETTE! The Frenchman picks the ball up on the right-hand side of the box and thumps an effort beyond Hart at the near post from a narrow action with the help of a slight deflection off Cresswell.
GOAL! ARSENAL! RAMSEY! Oh dear, Ramsey crosses from the left and Rice inexplicably ducks underneath it, leaving Hart wrong-footed and unable to do anything as the ball sails into the far corner.
79'
Another fine save from Joe Hart! Welbeck whips an effort towards the far corner from the edge of the box but the keeper get across to tip it wide!
78'
The game is becoming more stretched now, something that should suit the hosts.
74'
Hernandez heads straight at Ospina from Arnautovic's deep cross.
GOAL! WEST HAM! ARNAUTOVIC! Opsina punches a cross from the left away but he finds a West Ham man. Lanzini prods the ball into Arnautovic on the left and he powers a finish low across Ospina and into the far corner. Parity restored!
GOAL! ARSENAL! MONREAL! A corner from the left picks out Monreal on the penalty spot and he guides a volley (perhaps with a bit of shin involved) beyond Hart and into the bottom corner. Arsenal lead!
You lucky boy Pablo Zabaleta. The Argentine slides in on Welbeck as last man and the England striker is too quick for him, nicking the ball away before going down. Alexandre Lacazette is the first player on the scene screaming for red, but Lee Mason opts only for yellow.
48'
West Ham cry for a foul from Welbeck on Zabaleta as Bellerin crosses from the right but it isn't given and as the ball breaks to the edge of the box Monreal meets it, but Hart drops to gather his effort.
47'
Iwobi's touch evades him as he looks to create an early opening and West Ham clear.
HT: Arsenal 0-0 West Ham. Nothing to chose between the sides at the break. West Ham started well and went close through Cheikhou Kouyate, but Arsenal grew into the game as the half went on.
Granit Xhaka goes into the book for a late challenge on Arthur Masuaku.
39'
65% of the possession for the hosts so far, but it is West Ham who have come the closest.
35'
Bellerin's cross from the right is perfect for Welbeck at the far post but he gets up too early and can't guide his header on target.
34'
Xhaka takes it and catches it well, but Hart beats is away down to his right.
33'
Welbeck is caught late by Rice 22 yards out and Arsenal have a very dangerous free-kick.
31'
Welbeck drives from midfield and has a crack but he drags his effort well wide.
29'
An entertaining game this. West Ham are more than holding their own and could arguably be ahead based on the chances they've created.
25'
Welbeck's low, skidding effort curls just wide of the far post after he is fed by Monreal. Arsenal are improving now after that early spell of West Ham pressure.
23'
Iwobi feeds Welbeck in the box and Masuaku appears to have it covered, only to slip and present the former Manchester United man the ball. He pulls it back for Bellerin on the edge of the box but he can only curl over. A decent game this so far.
21'
Arnautovic holds the ball up before laying it off to Fernandes but he blazes well over the crossbar.
16'
OFF THE BAR! Kouyate meets a corner from the right six yards out and whilst he gets his header all wrong it still causes a moment of panic for Ospina as it loops high into the air and onto the top of the bar and behind.
15'
CHANCE! Mustafi hesitates with a bouncing ball allowing Arnautovic to get there before him and drives for goal in the left-hand channel. The Austrian looks for the far corner but Ospina parries his effort to safety.
13'
Kouyate flicks on a goal kick and it comes to Mario but despite showing quick feet to get away form one man his low effort form the edge of the box is straight at Ospina.
11'
This should be a chance! Arsenal's defence is all at sea positionally and Joao Mario just has to slip Fernandes in behind but he puts too much on the pass and the Swiss can't get there.
9'
The corner comes in and Koscielny meets it but it isn't a convincing effort and it drops wide.
8'
Monreal's attempted low cross is blocked behind by Zabaleta for a corner.
7'
Arsenal force a corner down the right but West Ham clear with little fuss.
3'
the sun is beating down on the pitch here at the Emirates, with an understandably tame pace to the game so far.
1'
Arsenal get the ball rolling here!
Start of match
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The players are out on the pitch and we'll be underway shortly!
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Did you know that Arsene Wenger has only lost one of his last 18 meetings with David Moyes?
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A win would boost West Ham's survival hopes, with them six points clear of the drop, despite having not won in their last six.
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Confirmation that Petr Cech and Mesut Ozil miss out due to a hip problem and illness respectively.
A few surprises from Arsenal there as Pierre-Emerick Aubameyang does not start, with it looking very much like the team for Thursday's Europa League semi-final first leg against Atletico Madrid, for which Aubameyang is ineligible.
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So, no changes for the 'Hammers' from their 1-1 draw with Stoke last time out as Joe Hart continues between the sticks and Manuel Lanzini is made to do with a place on the bench.
Hello and welcome! In many ways this game marks the start of a new era for Arsenal after Arsene Wenger confirmed that he will be leaving the club at the end of the season.