Stevenage registered a vital 1-0 win at Swindon to put themselves in pole position to seal automatic promotion.
Jamie Reid’s first-half goal took Borough four points ahead of Stockport and Carlisle with two games remaining.
Mansfield missed the chance to keep their automatic promotion hopes alive as they allowed a 1-0 lead to slip to a 2-1 defeat at home to champions Leyton Orient and sit outside the play-offs on goal difference.
Goals from Gavan Holohan and Danilo Orsi earned Grimsby a 2-0 win over Crewe – just their sixth home win but one which keeps them in the hunt for a top-10 finish.