Liverpool profited from a late own goal to beat Arsenal 1-0 and book their spot in the Women's FA Cup semi-finals.
It is the first time Liverpool have progressed to the last four since being knocked out at that stage by Manchester City in 2016-17, and marks their second consecutive win under Amber Whiteley, who replaced Matt Beard as interim head coach at the end of February.
Liverpool were the better side during a first half that lacked fluidity, frustrating Arsenal with their high press and making several forays forward through Olivia Smith on the right wing.
The best chance fell to Sophie Roman Haug on the stroke of half-time, who closed down Daphne van Domselaar as Arsenal tried to play out from the back but took too long to shoot, allowing the goalkeeper to recover.
Van Domselaar once again survived having her pocket picked by Roman Haug early in the second half, before the Norway international finally made Liverpool's pressure count in the 78th minute.
She struck a bouncing ball on the half-volley from just inside the box and her shot hit the post and rebounded in off the back of a stranded Van Domselaar.
"I don't know if I've got the words to be honest. I'm just so proud of everyone," said Whiteley.
"I thought we were so well organised. The work-rate was absolutely incredible, and we limited their chances and put them under pressure in front of their own goal.
"We will enjoy this moment."
Liverpool will travel to Chelsea in the semi-final, which is due to played on Sunday, 13 April.
Liverpool's high press frustrates Arsenal
Arsenal were the heavy favourites heading into this quarter-final clash.
Renee Slegers' side are third in the Women's Super League, 15 points above Liverpool, and are into the last eight of the Women's Champions League.
They'd lost just twice in nine matches in all competitions in 2025, scoring 30 goals, including putting five past Crystal Palace, Bristol City and Tottenham, and conceding just nine in the process.
But in Borehamwood on Sunday, Liverpool joined Chelsea as only the second side to prevent Arsenal from scoring this calendar year, and frustratingly for Slegers she accurately predicted the defensive strategy would be her side's downfall.
"They're not afraid of going high and pressing, that's at least what they've been doing before and then stepping out and being aggressive going forward," she said.
With Roman Haug, Smith and Marie Hobinger leading the forward press and defenders hunting in twos and threes, Liverpool restricted Arsenal's entry into the final third and frequently forced them to play the ball back to Van Domselaar, who was twice caught in possession by Roman Haug as Arsenal tried to play out from the back.
Despite having the edge on possession in the first half (56% to 44%), Arsenal failed to register a shot on target.
They had to wait until the 65th minute to register their first - and only - on target effort, with Rachel Laws getting a powerful hand to the ball to deny Frida Maanum's header from close range.
Liverpool have now kept back-to-back clean sheets since switching from a back five under Beard to Whiteley's favoured back four, an improvement which will be of great benefit to their attackers, who have not been free-scoring this season.
"We felt that we were under pressure a lot in the game," said Arsenal head coach Renee Slegers.
"For us, the Arsenal way is being good on the ball. That's very important for us. We just didn't have the quality that we usually do on the ball today.
"A couple of circumstances and stoppages don't allow us the rhythm, but that starts with our basics and the quality on the ball. That's definitely what we can control and what we want to do better next time."
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