Stoke - Stoke slumped to a fifth Premier League defeat in six games with West Ham's Marko Arnautovic scoring against his old club in a 3-0 win on Saturday.
Kick-off had been delayed by an hour due to a power cut. Once the match started, David Moyes' West Ham were sent on their way by a controversially awarded Mark Noble penalty in the 19th minute, which could result in retrospective punishment for Manuel Lanzini after he appeared to dive.
Stoke manager Mark Hughes faced chants of "Sacked (fired) in the morning" and "Hughes out."
Hughes' mood worsened with second-half goals from Arnautovic and substitute Diafra Sakho.
Arnautovic was jeered throughout the game after forcing a summer move to the Hammers, who moved above the Potters in the table with this win. West Ham rose to 15th and Stoke dropped to 17th.
Stoke chairperson Peter Coates had identified this fixture and last Tuesday's game with Burnley as pivotal and Hughes's position may now be precarious after two defeats.
A sign things could go wrong for Stoke arrived around an hour before kickoff when power was lost.
It remained out for almost an hour, delaying kick-off and leaving thousands of fans outside the bet365 stadium because the turnstiles could not be operated.