Arsenal produced a devastating first-half display to dismantle Chelsea and secure a fourth successive Premier League win. Alexis Sanchez took advantage of Gary Cahill's error to race clear and lift a composed finish over Thibaut Courtois after 11 minutes, and Theo Walcott completed a brilliant move to steer in Hector Bellerin's pass three minutes later. Mesut Ozil then left N'Golo Kante trailing to expose Chelsea on the counter-attack and steer home Arsenal's third five minutes before the break, after an exchange with Sanchez.