Match ends, Sheffield United 2, Peterborough United 0.
Ben Davies scored a superb free-kick and Chris Porter converted a Conor Coady pass to give Sheffield United their eighth consecutive win.
On-loan Derby midfielder Davies curled the ball in on his home debut just after half-time before substitute Porter drove in the second late on.
The Blades, who kept their sixth league clean sheet in a row, moved up to 10th.
Stephen McGinn earlier hit the post for much-changed United, who face Charlton in the FA Cup quarter-finals on Sunday.
McGinn was also denied by Posh keeper Bobby Olejnik and Callum McFadzean's low shot was deflected past the post.
It was a second straight defeat for Peterborough, who offered little and stay sixth.
Peterborough United boss Darren Ferguson told BBC Radio Cambridgeshire:
"It was a poor performance. Too slow in the first half.
"We knew they'd sit off us and try and break on the counter attack. But we didn't play with enough tempo.
"We couldn't have started the second half any worse.
"But the simple fact is we couldn't break them down."
- 17CoadyBooked at 65mins
- 14McGinnSubstituted forScougallat 53'minutes
- 18PaynterSubstituted forPorterat 66'minutes
- 26McFadzeanSubstituted forFlynnat 25'minutes
- 2AlcockSubstituted forNewellat 64'minutes
- 24WashingtonSubstituted forBostwickat 55'minutes
- 36McQuoidSubstituted forAssombalongaat 55'minutes
- Nigel Miller
- Shots on Target
Second Half ends, Sheffield United 2, Peterborough United 0.
Attempt missed. Joe Newell (Peterborough United) left footed shot from the centre of the box is close, but misses to the right.
Goal! Sheffield United 2, Peterborough United 0. Chris Porter (Sheffield United) right footed shot from the centre of the box to the bottom right corner.
Foul by Shaun Miller (Sheffield United).
Jack Baldwin (Peterborough United) wins a free kick on the right wing.
Corner, Sheffield United. Conceded by Sean Brisley.
Corner, Sheffield United. Conceded by Tommy Rowe.
Corner, Peterborough United. Conceded by Ryan Flynn.
Attempt missed. Ryan Flynn (Sheffield United) right footed shot from outside the box is close, but misses to the left.
Corner, Peterborough United. Conceded by Terry Kennedy.
Attempt missed. Conor Coady (Sheffield United) right footed shot from outside the box is just a bit too high.
Attempt missed. Britt Assombalonga (Peterborough United) left footed shot from outside the box misses to the left.
Hand ball by Joe Newell (Peterborough United).
Foul by Matthew Hill (Sheffield United).
Danny Swanson (Peterborough United) wins a free kick in the defensive half.
Substitution, Sheffield United. Chris Porter replaces Billy Paynter.
Conor Coady (Sheffield United) is shown the yellow card.
Jack Baldwin (Peterborough United) wins a free kick in the defensive half.
Foul by Conor Coady (Sheffield United).