Heracles moved to within a point of Eredivisie leaders Ajax after a 2-0 win at home to Heerenveen.
There were Eredivisie wins for both Ajax and PSV on Saturday, while second-placed Heracles slipped to defeat.
Heracles Almelo moved to the top of the Dutch league with a 2-1 win over champions PSV Eindhoven at the Polman Stadion on Saturday.
Wout Weghorst scored the only goal as high-flying Heracles beat ADO Den Haag 1-0 to climb to second in the Eredivisie.
Luuk de Jond rescued a point for champions PSV, while their were wins for Heracles and Roda JC.
Feyenoord and Roda JC secured opening day victories in the Eredivisie.