Arsenal cruised to a comprehensive 3-0 win over Chelsea to hand Antonio Conte's side back-to-back Premier League defeats in the London derby at Emirates Stadium.
A match expected to be a closely contested affair was blown apart in the 11th minute when Alexis Sanchez capitalised on a dreadful error by Gary Cahill to open the scoring on his 100th Arsenal outing.
Theo Walcott - also reaching a milestone in his 350th game for the Gunners - added a quickfire second, crowning a glorious passing move, and there was further attacking brilliance as the influential Mesut Ozil made it 3-0 five minutes before half-time.