United's U18s slipped to defeat against Bolton at Shirecliffe on Saturday.
A goal either side of half-time proved decisive for the Lancastrians, against a very youthful United side.
The Blades controlled the early stages of the game but chances were at a premium with a Parkhouse header flying wide and a Broadbent volley saved comfortably by the goalkeeper the closest the hosts came to an opener.
United almost went ahead midway through the first half after Broadbent's excellent cross found Doherty, but the skipper miss hit his shot.
With half-time approaching, the ball fell to Greaves on the edge of the area, but having unleashed his effort, a last-ditch block deflected the ball wide for a corner.
And right on 45 minutes the deadlock would be broken by Bolton. Having hit the post from distance, the visitors reacted quickest to the loose ball to tap home.
In added time parity was almost restored as a corner from the right found Doherty who forced a great reflex save out of the Bolton stopper.
In contrast to the first half Bolton started the second period on top forcing a superb save from Warhurst down low to his right.
But the visitors would double their lead on 51 minutes as Cutts was robbed of possession in the final third and the Blades were punished as Bolton added a second goal.
United looked for a route back into the game throughout the remaining minutes, but struggled to create any clear cut opportunities, although Parkhouse had a couple of efforts.
Before the end, Warhurst was called into action again to stop Wanderers adding a third, which would have been harsh on United.
Blades: Warhurst, Belehouan, Gordon, Weaver, Cutts, Broadbent, Lawrence (Capello 51), Doherty, Parkhouse, Greaves (Neal 65), Potts (Ompreon 79).