The 120th meeting between West Ham United and Chelsea ended all square, leaving Graham Potter’s men without an away win in eight games.
Emerson’s first half leveller cancelled out a fine Chelsea opener from João Félix, before a late offside call against Declan Rice denied the Hammers a vital victory.
Chelsea boss Graham Potter reinstated Félix to the starting XI as one of three changes, with the Portuguese prodigy having completed his three match ban following a debut red card.
By making a Premier League (PL) record 67 changes in his 16 games at the Stamford Bridge helm, the Blues’ manager eclipsed his predecessor Thomas Tuchel, but that decision to rotate was ratified early on, as Félix bursted forward with a trademark run from deep and was found by fellow newcomer Fernández, before clinically firing past Łukasz Fabiański.
The Hammers looked shell-shocked by the Blues’ fast start, but they drew level against the run of play midway through the first half, thanks to ex-Chelsea wingback Emerson.
With only seven goals in their previous 12 PL matches, Chelsea were desperate to make up for their lack of potency and avoid a run of eight games without an away win.
Without a goal since august, Tomáš Souček bundled home as Rice’s header could only be parried, but David Moyes was made to wait for his 250th PL win in agonising fashion, with Rice flagged offside after a lengthy VAR review.