The Polish shot-stopper was culpable for the opening goal, sending a clearance straight to a Crystal Palace shirt before being rooted to his line as Hangeland powered home. Largely a spectator otherwise, but will have Ospina breathing down his neck.
Deputised manfully at the heart of the defence, just as he did against Manchester City. Mopped up well at the back and never flustered on the ball, though his precious serenity did slip when he pulled back Bolasie to earn a yellow card.
The summer recruit from Newcastle practically played as a winger he was so far forward. Routinely hit the by-line and showed a good understanding with Alexis, and it was his shot that was parried into the path of Ramsey late on. On this evidence, Sagna will not be missed.
The leader at the heart of Arsenal's defence in the absence of Mertesacker. Matched the pace of Campbell and the physicality of Chamakh before guiding a header past Speroni to drag his back level, and was always composed and intelligent when in possession.
Was largely untroubled against Puncheon, marking the winger out of the game, but a troublesome hamstring came back to haunt him and he was subbed shortly after the restart.
Offered his usual calm at the base of the midfield, always showing for the ball and keeping possession ticking over. Couldn't always match the muscle of Palace's midfield though, and created nothing despite being granted plenty of time on the ball.
The Welshman remains the side's talisman, with his team-mates always looking to him for inspiration - and yet again he delivered. At the heart of much of the Gunners' slick, one-touch passing moves, and, late on, tapped in to claim all three points.
His jinking feet occasionally created pockets of space, which was at a premium as Palace sat back and dug in, but he failed to produce anything of real note and, with Arsenal searching for a winner, was sacrificed by Wenger.
Struggled a little against Palace's physicality and took some heavy hits, and his occasional moments of class were all too infrequent. It is games like this, against a deep defence, that Arsenal need their main string-puller to step up and take control.
The Frenchman, preferred to Giroud, tried to run the lines and threaten in behind but struggled against Palace's powerful back-line. Was given little service, and looked cumbersome when he was on the ball, before being replaced by his compatriot.
Immediately showed his South American flair, with devious flicks and no-look passes. It was his devilish free kick that helped level the scores. Still adapting and struggled with his end product from open play, but always got the crowd up off their feet.
The Argentine has become a thoroughly reliable shot-stopper at this level. Could do little about Koscielny's point-blank header or Ramsey's tap-in, but otherwise commanded his area well, made several good saves and was never ruffled.
Filling in at left-back, Ward initially struggled to pick up and contain the elusive Alexis, while Debuchy overlapped at will. But as the game progressed he grew in stature, and had Arsenal's right flank on lockdown by the end. An England call-up can't be far off.
The former Fulham skipper may have marked his Palace debut with a goal, darting from back to front to send a bullet header into the far corner, but he completely lost Koscielny for Arsenal's equaliser. Solid and commanding in the air otherwise.
The centre-back was always talking and organising the back-line, and helped to create a brick wall that Arsenal - despite their possession - really struggled to breach from open play. Covered his team-mates well with blocks and last-ditch challenges. Will be annoyed that Arsenal scored from a set-piece.
The former Liverpool youngster was thrown straight into the first team but looked like he had been a part of this well-drilled Palace defence for years. Rarely beaten, until Alexis switched flanks at least, and gave up little space in behind, but was less composed going forward.
Tracked back and worked hard off the ball, but never really got going in an attacking sense - more so when facing Gibbs. That said, it was his pin-point, whipped delivery that produced Hangeland's goal. Sent off late on for a silly foul.
The France-born winger showed occasional flashes of his quick feet, but was largely forced back into his own half by the adventurous Debuchy. Too often failed to track the former Newcastle man, though. More dangerous as the game wore on and spaces opened up.
The Australian showed that last season's dominant performances were no fluke, giving another monstrous display. Battled tirelessly, blockading the central midfield and constantly winning back the ball, while using it well too to release Palace's pacey attackers.
Sat in alongside Jedinak and made it hugely difficult for Arsenal, packing the midfield and protecting the back four. Had little opportunity to use the ball but stifled the home side's horde of playmakers well.
Provided a huge amount of desire and pacey closing down, though fed on scraps for much of the match. It was his industry that led to the corner from which Hangeland scored. Palace will need to start providing him with more ammunition in the future. Replaced late on.
Worked tirelessly to close down the ball-carrier and dropped into midfield when Arsenal advanced, though ultimately produced little and gave away a number of rash free kicks.
Yet another injury to Gibbs saw the Spaniard come on in his place. Was solid and continued to keep Puncheon quiet, though offered far less going forward.
Brought on in place of Wilshere as the Gunners looked to find a winning goal. More direct than his compatriot, hurling towards goal, but let down in the final third.
With half an hour left to play, the Frenchman came on in place of Sanogo. Given equally little service, though his movement occasionally had Palace at their panic stations.