Arsene Wenger’s 1,000th game in charge of Arsenal turned out to be an occasion to forget for the Frenchman as his 10-man team were crushed by Chelsea.
The game was over after 17 minutes, by which stage Chelsea were 3-0 up thanks to goals from Samuel Eto’o, Andre Schurrle and a penalty from Eden Hazard.
There was controversy also with Kieran Gibbs mistakenly sent-off in the first-half after Alex Oxlade-Chamberlain had clearly dived to handle an Eden Hazard shot that resulted in a penalty being awarded.
Two goals from Oscar on either side of halftime and then another from substitute Mohammed Salah completed the derby damage and handed Jose Mourinho his biggest victory as Chelsea manager.
Jose Mourinho deployed both Nemanja Matic and David Luiz in midfield with Ramires suspended and Frank Lampard on the bench.
Chelsea’s defence was unchanged from last time out with Hazard, Oscar and Schurrle behind lone striker Samuel Eto’o
Arsene Wenger meanwhile named an unchanged side that triumphed at north London rivals Tottenham last weekend.
Loan signing Kim Kallstrom was named on the bench for the first time since making the switch to the Emirates in January.
Giroud failed to make the most of Tomas Rosicky’s through ball, and Chelsea moved ahead almost immediately as a swift counter-attack ended with Schurrle switching the ball right to Eto’o, who cut inside Oxlade-Chamberlain before burying the ball in the net.
Chelsea went further ahead when, this time, Tomas Rosicky lost the ball and Nemanja Matic broke to find Schurrle. The German finding the far bottom corner with a crisp shot from the edge of the area – his seventh goal of the season.
Chelsea’s third came in the most controversial of circumstances. Alex Oxlade-Chamberlain handled on the line after 15 minutes to concede a penalty with Andre Marriner listening to his ear-piece before, amazingly, opting to send off left-back Kieran Gibbs instead of the offending winger.
Hazard made no mistake from the spot and it was soon four as Schurrle and substitute Fernando Torres created a simple tap-in for Oscar.
Arsenal made two half-time substitutions, leaving no further cover for injuries. Flamini and Jenkinson replaced Alex Oxlade-Chamberlain and Koscielny respectively.
But there would be no respite in the second half. Rosicky passed across the penalty area to Oscar on 66 minutes for the Brazilian to score from the edge of the box. Still Arsenal kept their highndefensive line, on 71 minutes Matic lifted the ball over it for Mohammed Salah to run and finish cooly, his first goal for the club.
Chelsea (4-2-3-1): Cech; Ivanovic, Cahill, Terry (c), Azpilicueta; David Luiz ( Mikel 70), Matic; Schurrle, Oscar (Salah 66), Hazard; Eto’o (Torres 9).
Arsenal (4-2-3-1): Szczesny; Sagna, Mertesacker, Koscielny (Jenkinson h-t), Gibbs; Oxlade-Chamberlain (Flamini) , Arteta (c); Rosicky, Cazorla, Podolski (Vermaelen 22); Giroud.
Sent off: Gibbs 15
Booked: Arteta 51
Referee: Andre Marriner