Source: BBC SportMansfield beat Wrexham to clinch the Blue Square Bet Premier title and secure promotion back to the Football League after a five-year absence.
The Stags went into the game knowing victory would send them up, with second-place Kidderminster Harriers sitting two points behind.
And Matt Green's 40th minute penalty, awarded after Louis Briscoe was tripped by Glen Little, sealed the win.
Play-off contenders Wrexham had David Artell sent off late on.
The centre-back received a straight red for a rash challenge on Colin Daniel, and it means the former Stags player is set to be banned for the Reds' play-off campaign.