VIDEO: Stags lose JPT derby 1-0 to local rivals Chesterfield
But the Stags deserved something out of a contest in which they missed some good chances, including twice being through one-on-one with Spireites keeper Tommy Lee.
In the end, a full-blooded derby game was decided by a 72nd minute moment when home keeper Alan Marriott left his line to deal with a cross and collided with his own defender, Ritchie Sutton.
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Hide AdGary McSheffrey slipped the loose ball into the empty net and Sutton was worryingly down for a full 12 minutes before being stretchered off concussed.
Here is a slideshow of images from the night.
Stags are back at home for the third time in eight days on Saturday when Bristol Rovers are the visitors.
To read the full match report click here