This felt like a huge opportunity for Arsenal to put some pressure on Liverpool after Arne Slot’s side dropped more points against Aston Villa on Wednesday.
West Ham held on comfortably in the end to move 13 points clear of the bottom three, as the Hammers secured only their second win under Graham Potter.
Arsenal missed the chance to close the gap to Premier League leaders Liverpool as they lost to West Ham.
Arsenal knew victory would have moved them to within five points of Liverpool ahead of their trip to Manchester City on Sunday.
But defeat for Arsenal means Liverpool can move 11 points clear if they win at the Etihad.