Stockport moved level on points with third-placed Hereford in League One as they dealt a hammer blow to Mansfield's survival hopes at Edgeley Park.
The Stags went ahead when Gary Dicker diverted a cross into his own net.
But Stockport levelled when Stephen Gleeson's inswinging corner was punched into his own net by Carl Muggleton.
Jake Buxton headed just wide for Mansfield before he brought down Tommy Rowe and was sent off, Liam Dickinson slotting home from the penalty spot.
Stockport: Ruddy, James Smith, Raynes, Owen, Rose, Gleeson (Pilkington 56), Taylor (Proudlock 56), Dicker, Blizzard, Rowe, Dickinson.
Subs Not Used: Conrad Logan, Shaleum Logan, McNulty.
Booked: Owen.
Goals: Muggleton 44 og, Dickinson 74 pen.
Mansfield: Muggleton, Mullins, Buxton, Baptiste, Jelleyman (Briggs 46), Hamshaw, Dawson (Wainwright 81), D'Laryea, Arnold, Michael Boulding, Louis (Horlock 81).
Subs Not Used: White, Brown.
Sent Off: Buxton (74).
Booked: Mullins.
Goals: Dicker 39 og.
Att: 4,982
Ref: Kevin Wright (Cambridgeshire).
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