Key events
72 min: The ball is played through to Timber, who makes a run to the edge of the box before sending a pass to Havertz, but a deflection takes it away from the strikerâs path and FabiaÅski can claim.
69 min: Another corner for Arsenal and this time Saka is there to take it. He sends a cross in and there appears to be a bit of confusion before West Ham eventually make the clearance.
67 min: Weâre 22 minutes into this second half and no more goals â whatâs going on?!
64 min: A double change for the hosts as Antonio makes way for Danny Ings and VladimÃr Coufal replaces Emerson, who scored arguably the best goal of the game so far.
61 min: There is some concern for Arsenal now as Saka is down with a knock. He receives some treatment from a physio and makes his way over to the sidelines.
Meanwhile, the visitors have a corner. Rice crosses it in with a relatively poor effort, but Paquetá attempts an even worse clearance and sends it behind for another corner. FabiaÅski punches clear the next one.
59 min: I donât know how but Zinchenko has found himself over on the right wing. He plays a pass inside to Ãdegaard on the edge of the box, who goes for goal, but FabiaÅski saves.
57 min: Another change for Arsenal as Oleksandr Zinchenko replaces Calafiori as left-back.
55 min: West Ham break forward as Paquetá is given plenty of space to carry the ball. He passes it through to Antonio, who shoots from the edge of the box and forces Raya into a fingertip save.
52 min: The ball is sent through to Bowen in the centre of attack, whose touch falls slightly away from him. He goes to make a run but Saliba catches him on the shin and West Ham have a free kick. Nothing comes of it, however.
49 min: Saka takes the corner and sends the ball towards the front post, where Calafiori makes a run, but West Ham clear the danger.
48 min: Arsenal look to play forward as Saka receives a pass on the right side of the box. Ãlvarez quicky comes across to make the challenge and sends the ball out for a corner.
47 min: Both teams made a change at the break, with Jakub Kiwior replacing goalscorer Gabriel for Arsenal. Meanwhile, Edson Ãlvarez is on for Summerville.
Kick-off: West Ham 2-5 Arsenal
And just like that, weâre back under way!
John Cox is not convinced about the free kick decision that led to West Hamâs secondâ¦
âWas it me or did that free kick arise from a really terrible decision? Hard to see how Rice could have won the ball more cleanly.â
Tony is taking a moment to consider ex-West Ham manager David Moyes: âSomewhere David Moyes is out there, perhaps relaxing in his most comfortable Chesterfield chair, sipping an irn bru and whisky, watching this game.â
Jeremy Boyce says: âWow! Is Premier League Footie the new NBA? Goals Goals Goals today, and we havenât even started on tomorrowâs fixture list of teams whoâve forgotten how to defend, champions and challengers alike. Goal-less second half ?â
Kári messaged in midway through the first half: âOn the one hand, matches like this is why I fell in love with the game. On the other hand, at 4-0 I was already starting to prepare to make another batch of gingerbread during the second half. Now these biscuits will never get made.â
Then got back in touch when the half-time whistle went: âOkay, now that itâs 5-2 maybe I can risk making a new batch without getting so gripped that I forget the gingerbread in the oven.â
This is the point where I usually try to summarise the first half. But, to be quite honest, I donât know where to start.
It was all Arsenal in the opening 30 minutes, but Mikel Artetaâs side gave West Ham a glimpse at goal late in the half and they took it with both hands. Two goals, two minutes, and everything changes. That late penalty makes things a bit more comfortable for Arsenal â just.
Half-time: West Ham 2-5 Arsenal
And, breatheâ¦
45+7 min: West Ham have another free kick, this time from a bit further out. Emerson steps up to take again and forces a fingertip save from Raya, Nothing comes of the following corner and that should be time.
GOAL! West Ham 2-5 Arsenal (Bukayo Saka, 45+5)
Saka converts the penalty, passing the ball into the bottom-left corner. FabiaÅski got a hand to it, but it was not enough.
PENALTY! Arsenal
Itâs a penalty! After a VAR check, FabiaÅski is booked for accidentally punching Gabriel in the head.
45+2 min: Arsenal have another corner and Gabriel goes for goal but collides with FabiaÅski. This could be a penaltyâ¦
45+1 min: Weâre into five minutes of added timeâ¦
44 min: Amid all the chaos, Saka and Emerson were booked for a clash on the left.
44 min: Despite being 4-2 up, Arsenal manager Mikel Arteta looks incredibly frustrated after giving away those two goals in quick succession. The visitors have to be careful here.
41 min: Rice gives away a free kick in a dangerous position just outside the box. Emerson steps up to take it and fires his strike off the crossbar and into the top-right corner!
I can barely keep up! What a game this has been so far!
GOAL! West Ham 2-4 Arsenal (Emerson, 40)
WHAT. A. HIT! WHAT A GAME!
39 min: Soler picks up the ball in midfield, turns and sends it through to Wan-Bissaka, who passes it into the bottom-right corner!
GOAL! West Ham 1-4 Arsenal (Aaron Wan-Bissaka, 38)
Wan-Bissaka gets one back for the hosts!
36 min: Ãdegaard receives the ball in midfield and sends a stunning pass over to Havertz in attack. Kilman goes to head it away but completely misses the clearance and Havertz takes it down before slotting into the bottom corner.
GOAL! West Ham 0-4 Arsenal (Kai Havertz, 35)
Havertz gets in on the action!