Kai Havertz's late winner off the bench was enough to see Chelsea steal the three points against West Ham.
The Blues won 2-1 against their East London opponents in what was overall a quiet affair at Stamford Bridge.
Michail Antonio gave the visitors the lead from Declan Rice's pass across goal, with Edouard Mendy struggling to keep the initial ball out.
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However, substitute Ben Chilwell soon equalised for the hosts with a neat finish through the legs of Lukasz Fabianski from a tight angle.
Havertz was then on hand to net the winner for the hosts, despite a late Maxwel Cornet goal being ruled out via VAR for West Ham
It is Chelsea's third win of the season and considering their performance against Southampton during the week, it was certainly an improvement.
Both Mason Mount and Havertz were dropped from the starting lineup, with Wesley Fofana making his debut in the backline.
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The debutant was quick to make an impression on his new side as he put in a good foot to steal possession from Michail Antonio.
Conor Gallagher appeared to be playing in a more advanced role in the Chelsea midfield, with Raheem Sterling and Christian Pulisic leading the line ahead of him.
Thomas Tuchel's side showed some attacking intent in the opening stages, with the Blues winning a couple of corners that failed to turn into real chances.
However, the German boss was unhappy with the lack of runs being showed, shouting instructions to Gallagher and Mateo Kovacic in the opening 20 minutes or so.
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Chelsea dominated the possession and their opponents were happy to sit back and watch play unfold.
Pulisic's shot soon went behind for a corner, and Kalidou Koulibaly headed over from the set piece.
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Kovacic then fired a speculative effort towards goal just after the half hour mark, which went wide of the post.
A superb ball from Sterling was fed into the path of Pulisic, the American international wad denied by a strong West Ham tackle.
Overall, the first half was a fairly dull affair, with the Blues finding it difficult to break down the Hammers.
Pablo Fornals was the first West Ham played to have a sight of goal, but his looping volley went high and wide of Edouard Mendy's goal.
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The slow tempo would soon continue until the break, with Chelsea failing to create any real chances from eight corners.
Tuchel decided not to make any changes at the start of the second half.
Fofana tried his best to emulate Antonio Rudiger's long-term shot antics, but his effort went wide of the post.
Gallagher did really well to track back and prevent Antonio from causing Mendy any trouble in goal, and the midfielder was applauded by the Chelsea faithful for his efforts.
Armando Broja and Mount were both introduced on the stroke of the hour mark, replacing Pulisic and Gallagher respectively.
However, West Ham took the lead soon after the changes, with Antonio netting from close range after Declan Rice's flick on across goal.
Chelsea decided more changes were needed, with both Havertz and Chilwell coming on for Kovacic and Marc Cucurella.
West Ham's lead did not last long though as Chilwell made an instant impact of the bench to equalise.
It was a smart finish from a tight angle from the left wing-back, nutmegging it through the legs of Lukasz Fabianski to get his side level.
From then on Chelsea worked hard to find a winner, with Jorginho being brought on for Ruben Loftus-Cheek as the Blues' final change of the afternoon.
Havertz was soon on hand to put his side into the lead with a finish inside the area, but Maxwel Cornet was there to net the equaliser just moments later.
However, the goal was ruled out through VAR for a foul on Mendy.
The full-time whistle soon came for Chelsea, and they sealed a vital three points in dramatic fashion.
Topics: Chelsea, West Ham United, Premier League