United's U21s equalised twice in the second-half to earn a deserved point against Coventry City on Monday afternoon.
Dion Kelly-Evans and George Thomas scored for the Sky Blues after the break, but the Blades responded with Sam Berry and substitute Dominic Calvert-Lewin scoring, the latter netting just two minutes after replacing Jamie McDonagh at City's Ryton training ground.
James Wallace completed just over an hour as he continues his rehabilitation from a troublesome groin problem, before making way for striker Daniel Cockerline.
United defended well against a lively City frontline in the first-half, the Sky Blues included Canadian international Simeon Jackson.
Goalkeeper George Willis made a couple of timely interventions, before Sam Berry did likewise to clear Jackson's effort off the line just before half-time.
The hosts were quickly out of the blocks in the second period and took the lead when KELLY-EVANS tapped home after Mohamed Coulibaly had rounded Willis.
United response came within 11 minutes, BERRY heading home from close range following a set-piece on the left.
Back to the other end and Coventry regained their lead when THOMAS lifted the ball over the oncoming Willis in 68th minute after a through ball from James Maddison.
The Blades refused to accept defeat though and substitute CALVERT-LEWIN made an immediate impact heading home just two minutes after coming on to the field.
At the death, Willis produced an excellent save to preserve the point, denying Kyle Spence.
The draw was United's second consecutive stalemate of the season, having drawn 0-0 with Colchester United at Shirecliffe last week.
Blades: Willis, Paling, Scarisbrick, Dimaio, Berry, McLean, Wallace (Cockerline 60), Whiteman, McDonagh (Calvert-Lewin 72), De Girolamo (Coustrain 81), Khan.
Unused: Evans, Ramsdale.