United started their U21 Professional Development League 2 (North) campaign with a deserved success over Coventry City on Monday afternoon.
Danny Philliskirk bagged a second-half brace for the Blades, including a penalty, only to miss the chance to net the matchball when having a second spot-kick saved.
The home side also missed from twelve yards, before Erik Tonne fired United ahead from a free-kick in the first-half. Shaun Jeffers netted a late consolation for the home side.
On a cloudy afternoon, Lee Carsley and Chris Morgan saw their teams play some open attacking football, with the first chance falling to the hosts, but Garner was denied by Long.
The home side were then given an ideal opportunity to opening the scoring, when Jeffers was upended by Long, but the striker stroked the resulting spot-kick wide.
United made City pay on the half hour mark when TONNE hit a left-footed free-kick low into the net past the hapless Fagan.
Before the break City could have levelled, but Jeffers hit the woodwork from O'Donovan's cross, before Christie produced a smart save from Long.
Six minutes into the second-half, the visitors doubled their advantage. Fagan mistimed his attempted clearance and PHILLISKIRK calmly finished from an acute angle.
United came close to adding a third on the hour mark when Fagan could only palm Chapell's stinging driving into the path of the onrushing Philliskirk, but his effort went agonisingly wide.
Moments later it was three, from the spot. PHILLISKIRK scored with ease after Ironside was fouled by Christie in the penalty area.
Five minutes from time Fagan denied Philliskirk a deserved hat-trick and the matchball when saving his penalty low to his left, after the goalkeeper was adjudged to have brought down Chapell.
In injury-time JEFFERS thumped home from 25 yards but it proved nothing more than a consolation.
Following the success Chris Morgan said: "In the end it was a really pleasing workout and result. We struggled in the first-half to cope with their formation, but after changing things round a bit at half-time we won at a canter in the second-half, with several outstanding performances."
Coventry: Fagan, Christie, Cameron, Edjenguele (Pegg 46), Willis (Lawton 61), Henderson, Garner, Wiseman, Roberts, Jeffers, O'Donovan (Forrester 61).
Unused: Gott, Bako.
Blades: Long, Hodder, T. Williams, Harriott, Salt, Kennedy, Chapell, McFadzean (Pemberton 78), Ironside, Philliskirk, Tonne (Smith 87).
Unused: J. Williams, Willis.