Four second-half goals paved the way for United's U21s to comfortably beat Barnsley at Shirecliffe.
Danny Philliskirk opened and rounded off the scoring to make it five goals in three games for him. Danny Rose equalised for the Tykes before half-time, but second-half efforts from Chris Salt, Erik Tonne and Jordan Chapell saw the Blades run out worthy winners.
In front a decent crowd at Shirecliffe, the home side started positively with Pemberton firing just over from 25 years after excellent build-up play involving Harriott, Ironside and Philliskirk.
At the other end Long fumbled an effort from Noble-Lazarus, before Rose fired into the side-netting after the Blades goalkeeper failed to collect a centre from Clark.
As the first-half progressed the home side gradually seized the initiative and deservedly took the lead. From Long's kick forward, Ironside controlled, held off his marker and slipped in PHILLISKIRK who finished confidently into the bottom corner. Tonne then fired just wide from a free-kick before Philliskirk should have netted his second after Ironside and Tonne had exchanged passes on the edge of the area.
With half-time looming Barnsley levelled, slightly against the run of play. Clark and Oates combined to free ROSE, who lobbed the ball over the advancing Long to restore parity at the break.
Fresh from Chris Morgan's and Richard Cresswell team talk, in front of the watching Danny Wilson, SALT powered home a header from a right-wing Chapell corner to restore the hosts' advantage within minutes of the restart.
Smith then replaced the injured Ironside, moments after Patterson had rattled Long's crossbar, but the home side extended the lead when Chapell played in TONNE, who slid the ball under Lidakevicius.
Two minutes later CHAPELL scored the goal of the game, rifling home from the point of the penalty area after breezing past Steade.
United continued to look dangerous going forward and after Westlake had advanced into a midfield role, Chapell and Tonne both had chances to double their tally. With five minutes remaining PHILLISKIRK rose unmarked in the six yard box to glance home his second and the Blades' fifth to wrap up a resounding success over the South Yorkshire rivals.
Blades: Long, Westlake, McFadzean, Harriott, Salt, Kennedy, Chapell, Pemberton (Hodder 79), Ironside (Smith 62), Philliskirk, Tonne.
Unused: Willis, J. Williams, T. Williams.