United's U18s stole the bragging rights at Middlewood Road on Saturday and in the process completed the league double of the Owls with another deserved success.
A late double from trialist Connor Hall put the Blades in the ascendency and despite a late consolation from the home side, United ran out worthy winners by the same scoreline as in the corresponding fixture at the SteelPhalt Academy back in August.
Despite the wet and windy conditions, United started brightly and were dominant for much of the opening 20 minutes.
During the first period Mallon and Maw on either flank were the main dangers for the Blades, although in a typical blood and thunder derby there was little in the way of goalmouth action.
As the game progressed into the second-half the visitors continued to pass the ball confidently and accurately, although the game still lacked that quality in the final third.
It appeared like being one of those frustrating derby matches that was until the game swung massively in United's favour in the 75th minute. Great combination play involving Brown and Gilmour resulted with the latter sending in a superb cross which was met by the head of HALL who nodded into the bottom corner.
Now in the lead, the visitors set about scoring that decisive second and it came four minutes from time as HALL reacted first to scramble the ball home from close-range following Semple's knock down.
Wednesday launched several balls forward in injury-time and got a goal back with the last meaningful action of the contest, but it mattered not as United left with all three points.
Blades: Perryman, Charlesworth, Brown, Gilmour, Cummings, Semple, Maw (Adebowale 89) Gordon, Litchfield (Hall 70), Hallam, Mallon (Ford 80).