West Ham won for the first time under David Moyes as Marko Arnautovic’s first goal for the club proved enough to beat a disjointed Chelsea at London Stadium.
The Hammers scored the only goal after just six minutes when Arnautovic curled a deft strike into the bottom corner after exchanging passes with Manuel Lanzini on the edge of the area.
Chelsea responded well before the break but were repelled by an organised West Ham defence and two solid saves from Adrian, retaining his spot in place of the dropped Joe Hart.
Both sides became increasingly ragged in the second half but West Ham desperately held on, with Chelsea striker Alvaro Morata firing wide when clean through late on.
Despite victory, the hosts remain in the bottom three, though they have drawn level on points with 17th-placed West Brom, who face fellow strugglers Swansea at 15:00 GMT.
Defeat means champions Chelsea will finish the weekend 14 points behind leaders Manchester City if Pep Guardiola’s side beat rivals Manchester United on Sunday.
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Source: BBC Sport