Michael Bostwick scored the winner as Stevenage won a five-goal thriller.
The hosts struck first through Steve Morison's penalty after Maxine Chanot brought down Mitchell Cole.
Mansfield equalised when Gavin Hurren's dipping shot found the bottom corner before Aaron O'Connor fired in to give them the lead.
Mitchell Cole's drilled effort restored parity and Bostwick sealed victory when keeper Paddy Gamble dropped the ball before Maxine Chanot was sent off.
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