United's Under 18s earned themselves a solid point away at Coventry City after goalkeeper Jordan Amissah made several late saves to maintain the 0-0 at the City Academy.
In a game where clear goal scoring opportunities were at a minimum for 80 minutes, Amissah made himself big to deny both Jack Burroughs and Costelus Lautaru in the closing minutes.
Coventry also started the quicker of the two sides, Jonathan Ngandu firing a curling effort against the bar before making a comfortable save from Burroughs.
United were solid defensively but struggled to create chances of their own, though they restricted their hosts to any further chances until just before the half-time interval.
A long ball up front allowed Lautaru to loft the ball past Amissah but Tom Williams got back brilliantly on the line to clear the danger.
United managed to get on the ball and create more in the second half, but the closest they came early on was when Sam Ackroyd's powerful free-kick found the side netting.
The Blades were forced into a couple of notes when Reon Potts went off with an ankle injury and captain Harrison Neal also had to depart after a nasty clash of heads.
Jake Kelly had a great chance to give United the lead when he flicked a long ball past the on-rushing Bilson but the ball dropped agonisingly wide of the Coventry goal.
Then Amissah came into his own as Coventry finished the game with a flourish. After some good work from Lautaru, Burroughs found himself clean in on goal but Amissah made himself big to divert his effort away for a corner.
It was a same story just minutes later as the game ticked towards its conclusion. This time it was Lautaru himself who used his pace to get in one-on-one with Amissah, but the Blades goalkeeper once again coming out on top and preserving United's 0-0 draw.
Blades: Amissah, Williams, Foulstone, Neal (McGuire 74), Weaver, Belehouan, J. Kelly, Broadbent, Ackroyd, Potts (Clarke 63), Ompreon
Unused: S. Kelly, Skeritt, Viggars