United's U18s maintained their 100% start to the campaign, with a last-gasp winner against Huddersfield Town at the SteelPhalt Academy on Saturday.
Tyler Smith was the Blades hero, heading home Alex Brown's pinpoint cross with just a minute remaining to spark wild celebrations at Shirecliffe.
And Lead Coach Derek Geary was understandably delighted, especially as his side hadn't had it all their own way against the Terriers.
Geary commented: "It was another good win in our toughest game of the season to date.
"Huddersfield played really well and put us under lots of pressure, but the lads remained compact, showed resilience and defended brilliantly.
"It's a terrific start for us and our hardwork is paying off with the results we have had, but there is still room for improvement as we look to develop the players further."
After a bright opening by the visitors that saw Perryman called into action on a couple of occasions, Mallon hit the woodwork for the hosts before Semple forced a save with a shot following a set-piece.
But it was Town who had the better of the first-half chances in wet and windy conditions, with Perryman at his best to deny Huddersfield twice either side of the half hour, with the second a superb fingertip save which saw him deflect the ball over the crossbar.
The interval came at a good time for United and the hosts were quickly out of the blocks in the second period, with Parkhouse heading straight at the goalkeeper when well placed.
United continued to look a live threat on the break, but were being forced to dig in and defend as Town looked for a breakthrough. At the other end, Hallam saw a shot blocked and Smith fired over.
With six minutes remaining, Town thought they had snatched the points, but Perryman was in top form again, this time saving with the aid of the post.
And that save was to prove crucial as the home side grabbed the victory in the 89th minute. Substitute Burton played the ball out wide to Brown who delivered an inch perfect cross for T. SMITH to head home, low to the goalkeeper's right.
The Blades saw the remainder of the game out well, to make it three wins from three in 2016/17.
Blades: Perryman, Portman, Semple (Cummings 45), Graham, Brown, T. Smith, Mallon (Burton 78), Slater, Gilmour, Hallam (Greaves 90), Parkhouse.
Unused: Warhurst, Ford.