Chelsea thrashed West Ham in Saturdays early kick-off to go second in the Premier League.
The Blues were looking to win their third consecutive away fixture - a new club record - at the London Stadium.
And within 18 minutes, Nicolas Jackson scored a brace to send Enzo Marescas men on their way.
West Ham were however denied what looked like a stonewall penalty before half time, after Wesley Fofana pulled at Crysencio Summerville inside the box.
Cole Palmer added a third goal on the break as Chelsea took their points tally to 10 in their first five games.
