Ravel Morrison and Will Keane both found the net twice as the hosts gradually made their class tell despite a spirited effort from the Yorkshire outfit. After Morrison's opener, Keane converted a penalty at the end of the first half following a handball by Terry Kennedy. Another strike from Morrison gave United breathing space but Joe Ironside pulled one back to leave Keane to supply the coup de grace late on.
Paul McGuinness named an unchanged side from the first leg but the Reds were slow into their stride against determined opponents. Gyliano van Velzen drifted a shot wide but the first spell of concerted pressure did not arrive until around the 10 minute mark with Paul Pogba mustering a couple of attempts.
Indeed, the closest we came to a goal inside the opening quarter of an hour was when Jordan Slew turned sharply to whistle a shot just wide. George Long was called into action at the other end when Morrison shrugged off Aaron Barry to reach a Pogba pass with the keeper pulling off a sharp save with his legs.
After a nasty clash of heads between Michael Keane and Elliott Whitehouse, Ironside planted a header onto the roof of the net as the Blades continued to hold their own. But the visitors were undone when Ryan Tunnicliffe's slide-rule pass released Michael Keane and his cross eventually fell to Morrison. Taking one touch to control the spinning ball, the talented No10 casually stroked it past Long for the opener.
John Pemberton's side reacted well to the setback by conjuring up chances of their own. After