Smilla Holmberg struck deep into stoppage time to deny Eva Olid her first win as Manchester United manager as Arsenal salvaged a 1-1 draw in the Women's Super League.
Having frustrated Arsenal for long periods, United snatched the lead in the 67th minute when Julia Zigiotti Olme pounced on an under-hit pass from Georgia Stanway, running through on goal to slot between the legs of Misa Rodriguez.
But in the fifth minute of time added on, Holmberg arrived at the back post to finish Leah Williamson's deep cross.
The result leaves Arsenal in fourth after a second consecutive draw, while United are off the foot of the table with their first point of the campaign.
Chelsea rose to second, two points behind leaders Manchester City, with a 2-0 win over Birmingham thanks to goals from Lexi Potter and Melvine Malard.
And London City Lionesses are third, one point further back, with a 4-1 win at promoted Charlton, who dropped to bottom spot after United's draw.
Isobel Goodwin's brace had London City two goals ahead after 15 minutes and, despite Jodie Hutton halving the deficit in the 39th minute with a fine finish, Jana Fernandez restored their advantage before half-time.
German forward Nicole Anyomi made sure the outcome was no longer in doubt with the Lionesses' fourth after 76 minutes.
