Ten-man Wisbech Town played championship party poopers at leaders Dereham Town on Tuesday.
The hosts needed just a point to seal the Thurlow Nunn League Premier Division title.
However The Fenmen won 3-2 after going behind. Wisbech replied with three second half goals from Danny White two and Chris Bacon.
Bacon later received a red card for a poor challenge.
Wisbech are looking good to seal the second place promotion spot, which they will do if they get at least a point at home to fourth-position Brantham on Saturday.