Substitute Rachel Williams pushed Manchester United into the fifth round of the Women's FA Cup after her hat-trick helped spark a 7-0 win over West Brom in the third leg.
Melvine Mallard opened the scoring for the fourth-placed Women's Super League in the 23rd minute at Leigh Sports Village, where it remained the only goal of the game until the floodgates opened after the break.
Williams replaced Mallard just before the hour mark and then nodded twice after Anna Sandberg's deliveries in the 77th and 79th minutes.
England international Ella Toone returned to action for the first time since being sidelined with a calf injury in November, and added her name to the scoresheet when she headed in United's fourth off the crossbar.
Celin Bizet added another in the 89th minute before Williams completed her hat-trick in the first minute of second-half stoppage time.
But Bizet – who may have wanted credit for what could have been the final touch on United's second goal of the game – also fell short, netting a double in the fifth minute of stoppage time.
It was the only FA Women's Cup game to go ahead after weather conditions forced a postponement Durham's travel to Brightonwhile five Sunday games were also cancelled.