Only four points now separate the Blades and Boro after this 1-0 defeat to the Hatters, thanks to Carlton Morris’ goal early in the second half.
Overall, it was a poor display by Paul Heckingbottom’s side who looked as though they had given the visitors too much respect as the home side and struggled to really get going from the first minute.
Here’s how we rated the Sheffield United players after a miserable day at Bramall Lane
1. Wes Foderingham - 6
Had very little to do bar pick up the odd mis-placed pass or grab an easy cross. Let down by his defence for the goal Photo: Lexy IIsley
2. Anel Ahmedhodzic - 5
Came closest to scoring in a dire first half with a decent header but that was easily saved by Ethan Horwath. Allowed Carlton Morris to get in front of him for the Luton opener early in the second half Photo: Andrew Yates
3. John Egan - 5
Never looked entirely comfortable up against Luton's frontline. Came closest to scoing an equalier late in the game but saw his shot blocked in amongst a scramble from a corner Photo: Andrew Yates
4. Jack Robinson - 5
Did his job at the back for the most part but offered little pushing forward, not helped by a lacklustre display by Max Lowe alongside him Photo: Michael Regan