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.
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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.