United's U18s made five consecutive league victories with a deserved Yorkshire derby success over Leeds on Saturday.
First-half goals from Connor Hall and Tyler Smith proved decisive in wintery conditions at Thorpe Arch as Travis Binnion's youngsters produced a disciplined display.
The Blades got off to the perfect start, going in front within two minutes. Hallam's attempt was parried and HALL was quickest to react to force the ball home from close range.
The hosts then enjoyed a period of prolonged possession, a theme that continued throughout most of the game, but it counted for little as the visitors doubled their lead.
Having scored a hat-trick as a substitute in last week's rout against Bolton Wanderers, Tyler Smith was heavily involved as United scored a second. He was fouled on the edge of the box following a strong run forward and HALLAM saw his resulting goal bound free-kick deflected into the net for his 14th of the season.
The Blades continued to defend in a resolute manner despite the building pressure from the home side with Adebowale and Cummings particularly strong at the heart of the back four.
The starting of the second half saw conditions significantly worsen but the Blades remained positive with Gilmour and substitute Kimarni Smith coming close to netting a third.
Smith then was at the centre of some controversy as he went down having rounded the Leeds goalkeeper, it looked like a stonewall penalty, but the referee waved play on, deeming the home stopper had got the faintest of touches on the ball.
Leeds continued to push forward as they had done throughout in search of a way back into game, but United stood firm to main their 100% record in 2016 with this hard fought success and in the process completed the double of their Championship rivals.
Blades: Perryman, Charlesworth, Brown, Gilmour, Adebowale, Cummings (Semple 71), T. Smith, Cantrill, Hall, Hallam (Ford 76), Mallon (K. Smith 59).
Unused: Warhurst, Burton