United's U18s slipped to defeat against Crewe Alexandra on Wednesday afternoon, as the Blades were again made to rue numerous missed chances.
Skipper Dominic Calvert-Lewin, who had earlier missed a first-half penalty, scored a brace as United recovered from going two goals behind, only to concede the decisive strike with four minutes remaining.
The visitors started brightly, with Calvert-Lewin and Slew a constant threat to the Crewe defence.
Calvert-Lewin had already missed two clear cut chances when he stepped up from the spot after Slew had been brought, but his penalty was well saved by the home goalkeeper.
As the first-half progressed, United continued to dominate and Adebowale missed the target with a free header from a corner, before Brown and Hutchinson both saw crosses go across the face of goal without being attacked as the teams headed to the interval level.
It was the visitors that were quickly out of the traps in the second-half too, with Calvert-Lewin and Slew both having good chances to open the scoring.
Slew then gave away a needless penalty in the 65th minute which was duly converted before Crewe doubled their advantage with their next attack.
CALVERT-LEWIN pulled on back in the 76th minute with a well struck left footed drive from the edge of the box and he atoned for his penalty miss two minutes later netting a fantastic solo effort, beating three players before converting from 15 yards.
With the momentum firmly in their favour the visitors should have kicked on and completed the comeback, but as the clock ticked down poor defending down the right allowed a speculative effort to be forced home from three yards, as the hosts snatched the win.
Blades: Ramsdale, Scott, Brown (Semple H/T), Gordon, Cheeseman (Ishmail 71), Adebowale, Hutchinson (Hinchliffe H/T), Ramsey, Slew, Calvert-Lewin, Kedman.