United's U18s notched a first away win of the season, with a deserved success at Colchester United on Saturday.
Second-half goals from George Broadbent and Cameron Hawkes paved the way for the victory, as United built on last week's success over Charlton Athletic.
The visitors were assertive from the first whistle, with Lawrence and then Greaves having efforts on goal in the opening minutes.
However, it was the U's that hit the front in the 23rd minute, with the advancing striker slotting past Warhurst to put the Blades on the back foot.
Before the break, United had a golden opportunity to level, only for Greaves to miss from the penalty spot.
The Blades weren't to be stopped though and in the 52nd minute they restored parity, with BROADBENT curling home into the bottom corner from the edge of the penalty area.
Colchester looked to hit back immediately, but thankfully for United, Warhurst was at his best to deny them following a break.
And in the 72nd minute the Blades scored what proved to be the game's decisive goal. A searching ball saw HAWKES through on goal and he slotted calmly past the goalkeeper to secure all three points.
Blades: Warhurst, Portman, Foulstone, Gordon, Cutts, Belehouan, Hawkes, Broadbent, Lawrence, Greaves, Potts.
Unused: Harriott, Dewhurst, Mason, McClellen, Ompreon.