Alexis Sanchez

Sanchez sends Arsenal second

Having set up Mesut Ozil for Arsenal's opener on 24 minutes, Sanchez capped a stunning individual display with three goals in 15 second-half minutes.

Andy Carroll's marked his long awaited return to the West Ham first-team with a goal nine minutes from time but Alex Oxlade-Chamberlain's response a minute later ensured it was mere consolation for the hosts, who remain a point above the relegation zone and without a league win since mid-October.