The visitors were still in control when Adriana Leon created the best chance for West Ham, going past two defenders and firing a long-range shot just over the crossbar from a tight angle. In the next minute, Kenza Dali whipped in a cross from the right and Van Egmond headed in past Mary Earps.
However, United responded quickly to restore their two-goal cushion before half-time, when Galton’s cross from the left was angled home by a fine header from Russo.
Although both teams had opportunities to add to their respective tallies, it wasn’t until the closing stages that they were able to do so. In the 83rd minute, Daly’s cross looped goalwards and completely caught out Earps, who got a hand to it but couldn’t keep it out.
Once again, the away side hit back within minutes through their substitutes, when Lucy Staniforth’s free-kick towards the back post was volleyed home by the unmarked Press for her first United goal.
“We shot ourselves in the foot today by conceding quite early,” said West Ham manager Matt Beard, whose side remain winless in the WSL this season. “We battled and got back into the game twice, but we need to be better in those moments.”
West Ham (4-3-3): Arnold 7; Redisch 6; Flaherty (c) 6, Fisk 6, Vetterlein 6 (Joel 73); Longhurst 6 (Cho 60), Van Egmond 7, Dali 7; Leon 7 (Lehmann 59), Thomas 6 (Svitkova 59), Daly 8.
Subs: Brosnan (g), Grant, Kiernan, Nor
Booked: Van Egmond, Daly, Dali
Manchester United (4-3-3): Earps 7; A Turner 7, McManus 7, M Turner 7, Okvist 7; Zelem (c) 8 (Ladd 68), Toone 7 (Staniforth 76), Groenen 7; Heath 8 (Hanson 61), Russo 8 (Press 76), Galton 8.
Subs: Ramsey (g), Smith, Ross, Sigsworth
Referee: Ryan Atkin