NAC Breda beat defending champions PSV Eindhoven 2-1 on Saturday to go top of the Dutch league, reports CNN.
PSV captain Timmy Simons scored an own-goal to put NAC in front in the 14th minute and Ghana forward Matthew Amoah doubled the advantage with his league-leading ninth goal of the season in the 87th minute.
PSV, who host Marseille in the Champions League on Wednesday, scored a consolation through Ibrahim Afellay in the final minute.
NAC have 15 points from six matches. Groningen, who lost 1-0 to Ajax to end their five-game winning streak, dropped to second with 13 points.
PSV remain third with 12 points, while Ajax are down in seventh place on 10 points.
In Amsterdam, Jan Vertonghen set up Oleguer for the game's only goal in the 37th minute.
Also on Saturday, Boldizsar Bodor and Sekou Cisse scored to help Roda to a 2-2 home draw with Heerenveen. Christian Grindheim and Arnar Smarason scored in the 38th and 87th minute for Heerenveen.