United's women's team fell to a second consecutive defeat to Olympic Legacy Park after an end-to-end encounter against Charlton saw United came out on the wrong end of a five-goal affair.
As they did against Tottenham, Carla Ward's side came out quickly and put pressure on their promotion-chasing visitors early on, with Ebony Salmon snatching at an early volley on her first start before Veatriki Sarri's tantalising cross was cleared before it reached Chloe Dixon.
Three corners in a row yielded little for the hosts as the blustery conditions played havoc when the ball was in the air, and the lack of goal scoring chances proved costly when Charlton opened the scoring themselves.
A cross into the box from Amber Stobbs appeared to have bent behind the line before Graham nodded in from no more than a yard at the back post to make it 1-0.
United though didn't let it bother them and created two big chances to score before the break. First, Salmon fired a low effort at Katie Startup before Danielle Cox headed Bex Rayner's cross inches wide.
The second half started in a slower fashion to the first and it was Charlton who had the biggest chance to extend the lead when Graham somehow beat the United defence and the goalkeeper with some neat skill before heading the ball over the bar with the goal at her mercy.
But just a minute later and it was 2-0, this time Agg scoring from close range to make life beyond difficult for Ward's side.
There was a response though and it came from one of many corners United had during the game. Sarri's ball in was headed down by Cox and in a scramble it appeared Rayner got the final touch to knock the ball over the line.
But with just over 10 minutes to go the sucker-punch came when Charley Clifford scored a superb free-kick from distance to make it 3-1.
There was to be late controversy though. Firstly, United were awarded a penalty when captain Ellie Gilliatt was fouled, the resulting spot-kick slotted home by Salmon, her first goal for the club on her 18th birthday.
In the sixth minute of stoppage time, Salmon herself was fouled inside the box but the referee signalled for a corner despite no clear touch on the ball from the defender.
It proved to be the last action of the game and ensured a frustrating finale for United.
Blades: Davies, Pennock, Tierney, Cox, Gilliatt, S. Barker, Cusack, Rayner, Sarri (Marsden 80), Salmon, Dixon (H. Barker 65).
Unused: Joyce, Kemp, Paul, Ford.