United's U18s slipped to an unfortunate home defeat against Crewe Alexandra at Shirecliffe.
Despite dominating for long periods of both halves, missed chances proved costly for the home side, whilst the visitors were ruthless in response.
After a tricky start, the Blades dominated the majority of the first-half and for long periods were cramped in the visitors half, although the Alex were a live threat on the break.
Kelly, Ramsey and Cockerline all had openings in the opening 30 minutes as United pressed for the opening goal and just before the Cockerline used his pace to latch on to Ishmail's through ball but his shot failed to beat the advancing goalkeeper.
The second-half turned out to be a very exciting contest for the neutral, but ultimately frustrating for the hosts.
United started well and Slew raced away, only to lose his footing at the vital moment. Moments later Slew find himself through on goal again, but having rounded the goalkeeper the Alex had got enough bodies back to block his route to goal.
Somewhat against the run of play, it was Crewe who opened the scoring in the 65th minute, Hinchliffe lost possession the middle of the park and despite having chances to clear United failed to do so and the visitors scored from a cut back.
With their tails up Crewe should have double their lead with their next attack, only for Ramsdale to produce a brilliant double save, a definite contender for save of the season.
The introduction of Litchfield saw United go three up front in a bid to get back into the game and having missed two chances in quick succession, SLEW made it third time lucky slotting home with his left foot in the 78th minute.
But the visitors responded immediately and regained their lead. United again laid siege to the Crewe goal in the final 10 minutes, Litchfield hit the post with a well executed volley before Kelly and Slew were denied in added time.
Blades: Ramsdale, Charlesworth, Brown, Ishmail, Evans, Kelly, Brooks, Ramsey (Litchfield 66), Cockerline, Slew, Hinchliffe.
Unused: Eastwood, Semple.