West Ham are struggling in the Premier League, languishing in 19th place as head coach Graham Potter faces mounting criticism and internal club scrutiny.
One part of their game that has been particularly concerning is their defending of corners, having conceded seven goals from these situations in five games.
Set-pieces are becoming increasingly important as club employ dedicated coaches who analyse how best to expose upcoming opponents.
BBC Sport has analysed West Ham's poor performance from corners and the tactics teams are successfully using against them this season.
Let's begin by looking at West Ham's 5-1 loss to Chelsea in August, a game in which Enzo Maresca's side scored three goals from corner situations.