United's Under 23s went down 1-0 to league leaders Leeds United at Thorp Arch despite a superb performance from a young Blades side.
Under 18 regulars such as Jean Belehouan, Kyron Gordon and Harrison Neal were up against a Leeds team including Barry Douglas, Tyler Roberts and Izzy Brown, the latter scoring the only goal of the match after 10 minutes.
Understandably, the hosts started on the front foot and it was Brown who tapped in a cross from the left from close range which would ultimately seal the three points.
But United created chance after chance and had a strong appeal for a penalty in the second half, but the ball just wouldn't find the net.
The clearest chance came just five minutes after Brown had given Leeds the lead. George Broadbent saw an effort saved by Miazek and somehow Reece York's effort from point-blank range was kept out by a defender on the line.
Oli Greaves was a constant presence in United's attacks, the forward testing Miazek with a free-kick before forcing him into another save with an effort from distance.
The young Blades stepped it up further in the second half and felt they should have had a penalty early in the second 45 when Harry Sheppeard was dragged down inside the box, but the referee signalled only for a free-kick.
Next it was a disallowed goal as good work from York saw a cross fall to Harry Boyes on the edge of the box, his effort was well saved by Miazek before the flag denied Broadbent who had tapped into an empty net.
The attacks kept coming though and it was York again who should have done better when he was played through on goal by Boyes, the midfielder flashing an effort wide at the near post.
Greaves and Boyes both saw efforts go wide in the closing 15 minutes of the match as the Blades did everything but find the back of the net on a day where there were plenty of positives to take away from the performance.
Blades: Eastwood, Ferguson, Belehouan, Broadbent, Gordon (Brunt 88), York, Sheppeard, Neal (Cantrill 67), Fernandes, Greaves, Boyes.
Unused: Dewhurst, Williams, J. Kelly.