Arsenal strengthened their grip on the Premier League title race with a hard-fought 2-1 triumph over Chelsea at the Emirates Stadium on Sunday afternoon.
The victory extends the Gunners' advantage at the summit to five points, though Mikel Arteta's side were far from convincing in a scrappy London derby.
William Saliba and Jurrien Timber both found the net from set-pieces to secure the three points for the hosts.
Chelsea will rue their own indiscipline, with Pedro Neto's dismissal reducing them to ten men and ultimately proving decisive in the closing stages of an entertaining contest.
The breakthrough arrived in the 22nd minute when Arsenal's set-piece prowess struck again.
Bukayo Saka delivered a deep corner to the far post, where Gabriel rose above Reece James to nod the ball down.
Saliba's flicked header then deflected off Sarr and into the net, though there remained some doubt over whether it should be credited as an own goal.
Chelsea responded before the interval by beating Arsenal at their own game.
Arsenal strengthened their grip on the Premier League title race
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Piero Hincapie attacked the near post from a corner and his header flew into the far corner, levelling the scores at 1-1.
The first half ended with both sides having traded scrappy goals from dead-ball situations.
The decisive moment came in the 66th minute when Timber headed home from a Declan Rice delivery.
Robert Sanchez appeared to collapse without any contact, drawing criticism for poor goalkeeping as the ball found its way past him.
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Chelsea will rue their own indiscipline
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Moments later, Neto's afternoon came to an abrupt end.
The Portuguese winger had already been cautioned for dissent following Arsenal's second goal.
When Gabriel Martinelli broke down the left flank directly from a Chelsea corner, Neto lunged in recklessly despite possessing a comparable pace to the Arsenal substitute.
The referee produced a second yellow card, reducing Chelsea to 10 men with more than 20 minutes remaining.
Neto's afternoon came to an abrupt end
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Neto became the ninth Chelsea player to receive a red card this season, with seven of those dismissals coming in Premier League matches.
The winger refused to leave the pitch immediately, instead arguing with the fourth official before staff members eventually guided him down the tunnel.
Despite their numerical disadvantage, Chelsea pushed hard for an equaliser in the closing stages.
Liam Rosenior introduced Delap and Garnacho to inject pace into his attack.
The visitors even had the ball in the net through Delap, but the goal was ruled out after Joao Pedro was adjudged to be offside in the build-up. Arsenal held firm to claim a vital three points.
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