Blades boss Nigel Clough admitted he was 'frustrated' following Saturday's narrow South Yorkshire derby defeat at the hand of Barnsley at Bramall Lane, despite being pleased with many apsects of United's display.
Looking back after Sam Winnall's header just before the hour settled the contest in front of a crowd nearing 25,000, Clough remarked: "It was a very good performance again for long spells, we have created a lot of chances and half chances, but we switch off from a corner and get punished.
"Games are often decided on fine margins, especially the higher you go or is local derbies and that proved to be the case in this one unfortunately.
"Their goalkeeper made a fantastic save from Craig Alcock's header in the first-half, but then in the second-half it is a free header in each box, Winnall scores his and McNultly heads over the bar."
The Gaffer added: "We got plenty of the ball to our wingers, but there weren't at their best on the day and when they did produce balls into the box we didn't do enough to get on the end of them.
"We hate losing at home but we can't get too upset, we have dominated the game and Mark (Howard) has hardly had anything to do.
"Barnsley deserve some credit, they frustrated us at times and managed to nick a goal from a set-piece at the other end, we have been in that position before and for them it was a job well done, for us it just didn't quite happen and that is frustrating."