Crystal Palace continued their recent revival to boost their Premier League survival hopes and leave Arsenal struggling to maintain their run of top-four finishes under Arsene Wenger.
Palace led through Andros Townsend’s close-range finish, doubling their lead when Yohan Cabaye’s shot looped in.
Luka Milivojevic clinched victory with a firm, low penalty as Palace moved six points clear of the relegation zone.
Sixth-placed Arsenal did not manage a shot on target in a poor second half.
Some travelling Gunners fans again called for manager Wenger, who has led Arsenal to top-four finishes in each of his previous 20 seasons at the helm, to leave the club.
The Frenchman’s side are seven points adrift of fourth-placed Manchester City with eight games remaining.
Feeble Arsenal put more heat on Wenger
The manner of Arsenal’s performance – disorganised, devoid of attacking ideas and lacking fight – will increase the scrutiny on Wenger yet again.
The 67-year-old has already faced protests from some supporters urging him to leave, with more calls clearly audible – along with the barracking of his players in the latter stages – at Selhurst Park.
Wenger’s contract expires at the end of the season and the club has offered him a new two-year deal, although he is still to announce whether he intends to carry on.
Arsenal had 72% possession against Palace but that mattered for little as the hosts broke quickly on the counter-attack, exploiting space down the flanks and taking their chances clinically.
The Gunners looked defensively vulnerable whenever Palace went forward, lacking leadership without injured captain Laurent Koscielny.
And when the visitors did attack, Palace keeper Wayne Hennessey was only required to make saves from Mohamed Elneny and Alexis Sanchez.
After the break, Hennessey did not even face a shot on target as Arsenal suffered a fourth straight away defeat for the first time under Wenger.
“Palace wanted it more. You could sense that from the kick-off,” Theo Walcott, Arsenal’s stand-in captain, said.
Big Sam to avoid relegation again?
While Wenger has never led Arsenal to a finish outside the top four, opposite number Sam Allardyce has a proud record of not being relegated from the top flight.
On this evidence, Allardyce looks much likelier to maintain his achievement than his long-time adversary.
The former England manager, who has previously kept up Bolton, Blackburn, Newcastle and Sunderland, took a while to improve Palace’s fortunes after replacing Alan Pardew in December, but the Eagles are starting to reap the rewards of his methods when it matters.
Palace had too much pace, power and passion for a lifeless Gunners side.
Although Arsenal dominated possession in the first half, Palace had the better chances and deservedly led when Townsend drilled in Wilfried Zaha’s cross from the right.
Palace leaked goals under Pardew, but have discovered defensive resilience under Allardyce – leading to four clean sheets in their past six league games.
That run has coincided with the arrival of centre-back Mamadou Sakho, the loan signing from Liverpool who again led their backline with a determined and disciplined performance.
It laid the platform for Palace to go on and secure victory after the break.
Cabaye clipped Zaha’s pass into the top corner before Gunners keeper Emiliano Martinez clumsily brought down Townsend, allowing Milivojevic to confidently tuck in his first Palace goal.
“Tactically the players were aware of what had to happen to beat Arsenal,” said Allardyce.
“Arsenal have been weak defensively – they leave the centre-backs exposed.”
Man of the match – Andros Townsend (Crystal Palace)
What the managers said
Crystal Palace manager Sam Allardyce, speaking to Sky Sports: “Tactically the players were aware of how to beat Arsenal. The first thing was to defend and frustrate them, keep them playing sideways, then use the space behind the full-backs. Arsenal have been weak defensively, they leave the centre-backs exposed.
“We won a lot of possession off them and created lots of chances. Cabaye’s goal, what a finish – and that was down to us pressing them. It wasn’t a shock for me because we played Chelsea and won that game. The result might be a shock, but we did that again and did it better.
“We all know Arsenal are going through their worst spell for years, but the only way to take advantage is by playing well. Everything worked perfectly for us today.”
Arsenal manager Arsene Wenger, speaking to BBC Sport: “We lost too many duels and we paid for that. There is no obvious reason why. We prepared well. It’s difficult to explain just after the game.
“I don’t think my players didn’t want it, but we lost duels in decisive moments and that’s how games are decided at this level.
“I understand our fans are disappointed and we all are deeply tonight. It’s very worrying and disappointing the way we lost the game. Palace were sharp, they beat Chelsea the other day, and that shows they have quality.
“We are in a difficult position. The game doesn’t help.”
Arsenal’s travel sickness continues – key stats
- Arsene Wenger has suffered four consecutive away Premier League defeats for the first time as Arsenal manager.
- This is Arsenal’s worst away Premier League run since April 1995 (also four defeats in a row) when they were managed by Stewart Houston.
- Wenger lost for the first time against Palace in 12 top-flight matches.
- Arsenal conceded three goals in four consecutive away league games for the first time since September 1929.
- In the past eight Premier League games, only Sunderland (six) have lost more games than Arsenal (five).
- Wilfried Zaha has had a hand in five goals in his past five Premier League games (two goals, three assists).
- Zaha now has nine Premier League assists for the season, matching the record held by Wayne Routledge in 2004-05.
- Sam Allardyce has won three consecutive home Premier League games for the first time since he was West Ham boss in December 2014.
Crystal Palace will look to earn the one win Allardyce believes they need to be assured of safety when they host Leicester on Saturday. Arsenal travel to Middlesbrough next Monday in a game with significant implications at both ends of the table.
Match ends, Crystal Palace 3, Arsenal 0.
Second Half ends, Crystal Palace 3, Arsenal 0.
Shkodran Mustafi (Arsenal) wins a free kick in the defensive half.
Foul by Christian Benteke (Crystal Palace).
Attempt missed. Alex Oxlade-Chamberlain (Arsenal) right footed shot from outside the box is high and wide to the right. Assisted by Granit Xhaka.
Foul by Aaron Ramsey (Arsenal).
Jason Puncheon (Crystal Palace) wins a free kick in the defensive half.
Attempt blocked. Christian Benteke (Crystal Palace) right footed shot from outside the box is blocked. Assisted by Jeffrey Schlupp.
Substitution, Crystal Palace. Damien Delaney replaces Wilfried Zaha.
Offside, Crystal Palace. Joel Ward tries a through ball, but James McArthur is caught offside.
Corner, Crystal Palace. Conceded by Nacho Monreal.
Attempt missed. Christian Benteke (Crystal Palace) right footed shot from the centre of the box misses to the left. Assisted by Andros Townsend with a cross.
Shkodran Mustafi (Arsenal) wins a free kick in the attacking half.
Foul by Andros Townsend (Crystal Palace).
Aaron Ramsey (Arsenal) wins a free kick in the attacking half.
Foul by Jason Puncheon (Crystal Palace).
Substitution, Crystal Palace. Mathieu Flamini replaces Luka Milivojevic.
Delay over. They are ready to continue.
Delay in match Mamadou Sakho (Crystal Palace) because of an injury.
Corner, Arsenal. Conceded by Joel Ward.
Granit Xhaka (Arsenal) wins a free kick in the defensive half.
Foul by Christian Benteke (Crystal Palace).
Substitution, Crystal Palace. James McArthur replaces Yohan Cabaye.
Corner, Arsenal. Conceded by Martin Kelly.
Corner, Arsenal. Conceded by Joel Ward.
Attempt blocked. Alexis Sánchez (Arsenal) right footed shot from the left side of the box is blocked. Assisted by Aaron Ramsey.
Attempt missed. Héctor Bellerín (Arsenal) right footed shot from the right side of the box misses to the left. Assisted by Alex Oxlade-Chamberlain.
Substitution, Arsenal. Alex Oxlade-Chamberlain replaces Theo Walcott.
Goal! Crystal Palace 3, Arsenal 0. Luka Milivojevic (Crystal Palace) converts the penalty with a right footed shot to the bottom left corner.
Penalty conceded by Emiliano Martinez (Arsenal) after a foul in the penalty area.
Penalty Crystal Palace. Andros Townsend draws a foul in the penalty area.
Attempt missed. Christian Benteke (Crystal Palace) right footed shot from the left side of the box misses to the right. Assisted by Wayne Hennessey following a set piece situation.
Foul by Héctor Bellerín (Arsenal).
Andros Townsend (Crystal Palace) wins a free kick in the defensive half.
Goal! Crystal Palace 2, Arsenal 0. Yohan Cabaye (Crystal Palace) right footed shot from the right side of the box to the top left corner. Assisted by Wilfried Zaha.
Substitution, Arsenal. Olivier Giroud replaces Danny Welbeck.
Substitution, Arsenal. Aaron Ramsey replaces Mohamed Elneny.
Mohamed Elneny (Arsenal) wins a free kick in the defensive half.
Foul by Yohan Cabaye (Crystal Palace).
Attempt missed. Héctor Bellerín (Arsenal) right footed shot from the right side of the box misses to the right. Assisted by Alexis Sánchez.
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