Northampton are on course to go second after Louis Appere hammered them ahead at Sutton following a classic long throw-in routine.
The clash between play-off chasers Carlisle and Stockport is going the visitors' way, Myles Hippolyte scoring the first goal of the game after 31 minutes. County will be two points off the top three if results continue as they are, while United will be sixth.
Hiram Boateng has given Mansfield the lead at Newport. The Stags really need to win to stay level on points with Salford in the final play-off position, because Louie Barry has put City 2-0 up at second-bottom Hartlepool.