Two relatively strong first XIs jostled it out at Anfield here, with Arsenal going close in the opening exchanges only for Adrian to save well from Eddie Nketiah.
Liverpool then grew into the game and should have opened the scoring only for Takumi Minamino to miss from six yards when it looked easier to score.
Bernd Leno was proving he was worthy of being Arsenal’s number one as he saved well from Diogo Jota midway through the second half.
And despite some late pressure from the home side, the game eventually went to penalties.
Harry Wilson missed for Liverpool, which meant that Joe Willock had the chance to win the shoot-out for the Gunners, which is exactly what he did.