Hartlepool put a dent in Peterborough's promotion aspirations with a well-deserved 2-0 win at Victoria Park.
Peter Hartley and Gary Liddle netted the goals as Pools saw off a visiting side who were down to 10 men for the closing stages following the dismissal of Lee Tomlin.
In an game which never let up from start to finish, Andy Monkhouse hit a post after just nine minutes with a clever stooping header which beat Joe Lewis but not the frame of the goal.
Home keeper Jake Kean saved from Craig Mackail-Smith after he nipped in across the defence, and as half-time approached George Boyd headed over as the ball bounced up in front of him.
But with 44 minutes on the clock Pools took the lead when Evan Horwood's inswinging corner was powerfully headed home from eight yards by Peter Hartley.
Posh were again denied by Kean after 72 minutes, Tomlin's 25-yard free-kick heading for the top corner before the keeper stretched to push it over.
Tomlin then saw red with eight minutes remaining for a lunge on Leon McSweeney.
Posh still almost levelled, though, when Boyd's curling shot was somehow clawed out by Kean.
But there was time for Hartlepool to net a second, Liddle sweeping into the bottom corner on 89 minutes from distance to secure three successive wins.
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