FULL TIME: It's all over at the Emirates and Palace secure the three points. Arsenal's top four hopes have taken a blow here due to their calamitous defending.
There will be five minutes of time added on.
Chance! Maitland-Niles finds space down the right and his cross is missed by everyone and almost sneaks into the far corner but Guaita tips it around the post. Good goalkeeping.
Booking: Mustafi caps a quite woeful display by being booked for simulation as he tries to dribble out with the ball.
Substitution: Benteke and Meyer are off. Fresh legs on in the shape of Townsend and Ayew.
GOAL! Comeback? Out of nothing, there is life in Arsenal. All made by Aubameyang. He dances past three tackles off the right but gets blocked out of things. He earns his bit of luck though as the ball bounces to him and fires it low into the corner.
It's all very slow now from Arsenal, who could be feeling the effects of a busy week. Kolasinac gets down the left but boots his cross straight out of play. I'd say Palace look the more likely to add the next goal.
GOAL! Arsenal are crumbling! A corner from the right is won by Dann. His header flies across goal and McArthur follows it in from close range. He was in so much space there. Horrendous defending again.
Substitution: Elneny is replaced by Torreira. Arsenal need a lift here.
GOAL! Benteke wins a flick on but Mustafi looks in control of the situation. However, he thinks Leno is coming to mop up but he's too far out for that. Zaha is lurking behind him and accelerates through on goal and slides one past Leno.
Arsenal sense a second here. Aubameyang almost meets a Maitland-Niles cross from the right. It drops out to Kolasinac who takes on a tricky half-volley from 22 yards. He catches it sweetly but Guaita is right behind it.
Superb defending from Maitland-Niles. Zaha moves centrally and gets in behind Mustafi, who is caught napping. He doesn't quite get away though and the full-back shows amazing pace to sprint back to mop up. Impressive.
Palace are finding it tough to get up the pitch now. I've just caught a glimpse of Roy Hodgson's face on the bench. He's got one like thunder. Palace should have been out of sight in the first-half.
The hosts look far more energised and dangerous since the break. Aubameyang - who has been quiet - is released down the right edge but his cross-shot is forced behind. The corner is cleared.
GOAL! Arsenal are level! Ozil from a tight angle. It's one of his trademark finishes where he hits it into the ground so that it bounced over the goalkeeper. World class, that.
SECOND HALF: We're back underway for the second half.
Substitution: Arsenal make a double change. Alex Iwobi and Ainsley Maitland-Niles come on for Carl Jenkinson and Konstantinos Mavropanos.
HALF TIME: Palace take a deserved lead into the break. Benteke's header separates the two sides. Arsenal 0-1 Crystal Palace.
Palace hit on the counter. Kouyate is released into space down the right and fires one from a tight angle. Leno blocks it then is up quickly to force the loose ball behind for a corner.
Chance! Ozil feeds Lacazette on the edge. He spins and tries to curl one into the far corner but he's on the stretch. Not troubling Guaita that one.
NO PENALTY! Kolasinac gets down the left and pings in a cross which is blocked away by Wan-Bissaka's arm. He was only six yards away when the Arsenal man struck it, but his arm was outstretched. Certainly looked a good shout. Jon Moss says no.
Block! First Kelly, now Dann gets involved. Lacazette swerves into space inside the area but his strike from a tight angle is seen clear by the determined Palace centre-half.
Arsenal starting to probe now. They are keeping Palace's defence very busy. Kelly has already made four clearances inside his own box. He's had a half to remember.
Arsenal go close from a set-piece of their own. Ozil floats one into the near post which Mavropanos flicks on. It falls for Mustafi at the back stick but he can't direct his header on target. Over the crossbar.
This is vintage Palace on the road. Defensively organised and confident on the break. Benteke is playing a blinder as the focal point. They enjoy a good spell of possession in around the Arsenal box but Zaha can't quite fashion some space for a shot.
A ball into the Palace box gets Lacazette sniffing. He tries to swivel and fire one home from 10 yards but Kelly makes a fantastic diving tackle. He then gets up and makes another block. Heroic.
GOAL! From the resulting free-kick. Arsenal are all over the place. It's a fantastic delivery from the right but Benteke is unmarked, eight yards from goal and has the simplest of tasks to head home. Arsenal 0-1 Crystal Palace
Booking: Mavrapanos goes into the book for tugging at Benteke's shirt on the right flank.
Zaha gets caught with a flick of Guendouzi's book and squares up to the Arsenal midfielder. There's a few words exchanged but both get on with their day.
Chance! Corner for Palace. Dann is free at the back post again. He bullets a header across goal and Kelly charges in from six yards but Mavropanos manage to turn it over the crossbar! Great defending.
Jenkinson provides the width and skids a ball into the middle. Kelly half-clears it up in the air and Elneny tries to hook a volley home from 15 yards. Miles over.
Palace go direct from a set-piece and Dann gets free at the back. His header drops to Meyer about 15 yards out but his effort is blocked. Zaha tries to trick his way into space but the move breaks down. Encouraging signs for the away side.
Chance! Kolasinac puts pressure on Wan-Bissaka, who is playing on the right of the Palace defence with Ward on the left. The ball ricochets to Ozil on the edge. He bends one with his left but Guaita holds on.
KICK OFF: We're underway at the Emirates!
Good afternoon and welcome to our coverage of this Premier League clash between Arsenal and Crystal Palace, live from The Emirates.
Theres plenty to play for here for Arsenal. A win today would see them jump Spurs, who lost to Man City yesterday, and take third position. Putting them in a very strong position in achieving their goal of Champions League football.
The remainder of Crystal Palace's games hold less importance. They're in fourteenth position with a Europa league spot unachievable and they are safe from relegation. Perhaps they will look to cause an upset at the higher end of the table.
Arsenal Team News: Sokratis serves the last of a two-game ban for collecting 10 bookings while Denis Suarez (groin) will be assessed ahead of the match, with long-term absentees Danny Welbeck, Rob Holding and Hector Bellerin still missing.
Aaron Ramsey suffered a hamstring injury in Thursday's Europa League win over Napoli and - with a summer move to Juventus already agreed - he may have played his last game for the Gunners.
Crystal Palace Team News: The hosts will be missing Jeffrey Schlupp, who was substituted in the first-half of Crystal Palace's defeat against Manchester City in their last outing due to an ankle issue. Sakho and Tomkins are also unavailable.
Arsenal XI: Leno, Koscielny, Jenkinson, Mustafi, Kolasinac, Mavropanos, Guendouzi, Elneny, Aubameyang, Ozil, Lacazette.
Subs: Cech, Mkhitaryan, Torreira, Maitland-Niles, Iwobi, Monreal, Nketiah.
Crystal Palace XI: Guaita, Ward, Dann, Kelly, Wan-Bissaka, Kouyate, McArthur, Milivojevic, Meyer, Zaha, Benteke.
Subs: Hennessey, Van Aanholt, Townsend, Ayew, Batshuayi, Sako, Riedwald.
Following their 2-2 draw at Selhurst Park earlier this season, Crystal Palace are looking to avoid defeat in both league meetings with Arsenal in a campaign for the first time since 1979-80.
Arsenal have won each of their last six London derbies at home in the Premier League, their best such run in the competition since 11 straight victories between December 2001 and November 2003.
The two sides are making their way out of the tunnel. Kick-off will follow shortly.
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