Match ends, Sheffield United 1, Peterborough United 2.
Peterborough United struck twice in the final two minutes at Sheffield United to make it two wins from two for caretaker boss Dave Robertson.
The Blades looked set to continue their six-game unbeaten run when Matt Done nodded in after Ben Alnwick saved his initial shot.
But Jack Payne, having already hit the post, levelled in the 88th minute from 20 yards.
And Conor Washington struck at the death to complete a late comeback.
United retain a five-point cushion in the play-offs but Posh, who parted company with boss Darren Ferguson last week, are two points adrift of the top six.
- 18CouttsSubstituted forHoltat 45'minutes
- 12McNultySubstituted forReedat 63'minutes
- 14DoneSubstituted forFreemanat 81'minutes
- 22Almeida Santos
- 8PayneBooked at 23mins
- 17NewellBooked at 58mins
- 9JamesSubstituted forMcLeanat 79'minutes
- 12VassellBooked at 41minsSubstituted forWashingtonat 56'minutes
- Oliver Langford
- Shots on Target
Second Half ends, Sheffield United 1, Peterborough United 2.
Michael Doyle (Sheffield United) hits the bar with a left footed shot from the centre of the box following a corner.
Corner, Sheffield United. Conceded by Gabriel Zakuani.
Goal! Sheffield United 1, Peterborough United 2. Conor Washington (Peterborough United) right footed shot from the right side of the box to the top left corner. Assisted by Aaron McLean.
Goal! Sheffield United 1, Peterborough United 1. Jack Payne (Peterborough United) right footed shot from outside the box to the bottom left corner. Assisted by Jon Taylor.
(Sheffield United) wins a free kick in the attacking half.
Foul by Ricardo Santos (Peterborough United).
Attempt blocked. Joe Newell (Peterborough United) right footed shot from the centre of the box is blocked.
Corner, Peterborough United. Conceded by Louis Reed.
Attempt blocked. Kgosi Ntlhe (Peterborough United) left footed shot from the centre of the box is blocked.
Corner, Peterborough United. Conceded by Robert Harris.
Substitution, Sheffield United. Kieron Freeman replaces Matt Done.
Foul by Robert Harris (Sheffield United).
Joe Newell (Peterborough United) wins a free kick in the defensive half.
Corner, Peterborough United. Conceded by Chris Basham.
Substitution, Peterborough United. Aaron McLean replaces Luke James.
Jack Payne (Peterborough United) hits the left post with a right footed shot from outside the box.
Ryan Flynn (Sheffield United) wins a free kick in the defensive half.
Foul by Kgosi Ntlhe (Peterborough United).