Samuel Eto’o and Andre Schurrle put Chelsea ahead as Arsene Wenger celebrated his 1,000th Arsenal game.
Only moments after Petr Cech produced an excellent save from Olivier Giroud, Eto’o calmly slotted past Wojciech Szczesny for the opener.
Just over two minutes later, Schurrle grabbed his seventh league goal for Chelsea with aplomb.
And then… ah here… Alex Oxlade-Chamberlain handled Fernando Torres’ shot on the line, Kieran Gibbs was mistakenly sent off by Andre Marriner and Eden Hazard scored the penalty.
Fernando Torres – on for the injured Eto’0 – set up Oscar for Chelsea’s fourth just before half-time.
Oscar grabbed Chelsea’s fifth and his second of the game in the 67th minute.
Mohamed Salah’s first goal for Chelsea followed as things got even more embarrassing for Arsenal.
