United's U21s made it five wins on the bounce in 2015 with a hard fought, but deserved victory over Barnsley at Oakwell Academy.
Having fallen behind to an early Rhys Oates penalty, United hit back before half-time with CJ Hamilton equalising, before Callum McFadzean netted what proved to be the winning goal from the penalty spot just after the half hour.
It was Barnsley who opened the scoring with their first attack in the 7th minute. OATES outpaced Berry and tempted the centre-half into making a challenge in the box, the referee didn't hesitate in awarding the spot-kick and the Reds number 9 dusted himself down before firing past Willis into the bottom corner.
United were only behind for seven minutes though as CALVERT-LEWIN restored parity, applying the finishing touch from close-range after Hamilton had been freed down the left by McFadzean.
The Blades were now in the ascendency and should have taken the lead through Whiteman; firstly he saw a shot goes inches wide from the edge of the penalty area, before putting the ball over the ball on the rebound moments later.
After Wallace had fired over in the 34th minute,
United made their superiority count in their next attack, MCFADZEAN and Hamilton combined on the left and after the latter was adjudged to have been upended in the penalty area, United's left-back stepped up to confidently send Davies the wrong way from the spot.
Before the interval, Calvert-Lewin steered narrowly wide from Hamilton's inviting centre. United made a change at the break with trialist Sukar replacing Kieran Wallace.
The opening exchanges of the second period were scrappy, with Jennings having a couple of long-range efforts for the Tykes, before Calvert-Lewin scooped over when well placed for the visitors.
As the game progressed goalscoring opportunities were at a premium with the pitch cutting up and looking heavy and despite a few minor scares United held on to make it five wins from five outings since the turn of the year.
Blades: Willis, Paling, McFadzean, Dimaio, Berry, Evans, Coustrain (Cockerline 62), Whiteman, Calvert-Lewin, K. Wallace (Sukar 45), Hamilton.
Unused: Ramsdale, Brooks.