Slaven Bilic's side dealt a Hammer blow to Tottenham's title chances with a 1-0 victory at the London Stadium on Friday Night Football.
A hotly-contested London derby was settled through a single goal - struck by West Ham midfielder Manuel Lanzini in the 65th minute.
But aside from all the on-field action at the London Stadium, there may have been some things you missed from a match which looks set to hand Chelsea the Premier League title.
Casual Friday on Sky Sports
Sky Sports presenters on Friday Night Football duty caught the eye for their rather casual get-ups in the studio.