The visitors were 4-0 up at half-time thanks to goals from John McGinn, Ollie Watkins, Leon Bailey and Youri Tielemens, with Alex Mereno adding a fifth shortly after the break. United looked to have grabbed a consolation goal in added time when Vini Souza tapped home but after a lengthy VAR check, the strike was ruled out for offside.
Here's how we rated United's players as their faint survival hopes took another severe battering at Bramall Lane ...
13. Jack Robinson 4
Replaced Norrington-Davies and almost got on the scoresheet with a towering header that was smothered clear
Photo: Matt McNulty
14. Ben Osborn 4
Came on in place of Brooks and was industrious as ever without finding the touch of invention - although he was far from alone in that regard
15. Cameron Archer 4
Faced his boyhood club for the second time this season after coming off the bench for Brereton Diaz but couldn't repeat his feat of scoring at Villa Park, although he showed a bright moment when he ran onto Davies' pass and forced Cash to block his cross
16. Tom Davies 4.5
Made his long-awaited return from injury and showed a glimpse of what he can bring to the survival fight with a lovely threaded pass to send Archer free. Showed some other nice moments on a day of few positives for the Blades