Arsenal played for more than an hour with 10 men, but were able to withstand Liverpool pressure to claim a goalless draw in the first leg of the team's Carabao Cup semifinal.
The game's key moment came in the 24th minute, when Arsenal's Granit Xhaka was sent off for denying Diogo Jota a clear goalscoring opportunity with a high foot that felled the Liverpool forward just outside the Arsenal penalty area.
The incident necessitated a switch in Arsenal tactics to a three-man defence, with Mikel Arteta bringing on Rob Holding for Eddie Nketiah.