Ajax came through a stern test to claim three Eredivisie points against a spirited ADO Den Haag side, 3-0.
Demy De Zeeuw opened the scoring after 26 minutes, but the Amsterdam giants had to wait until 19 minutes from the end to add their second through Marko Pantelic. Siem De Jong then added a third in stoppage time.
Struggling Heerenveen collected only their second three-point haul of the season so far as Sparta Rotterdam remained winless in five games at home.
Viktor Elm's penalty with 17 minutes to go sealed victory after Paulo Henrique had put Heerenveen in front late in the first half.
Feyenoord recorded their fifth win of the Eredivisie season at the expense of NAC Breda, although the late dismissal of Denny Landzaat took the shine off the 2-0 result.
Andwele Slory and Leroy Fer found the target for the Rotterdam club, with the second goal coming shortly after Landzaat had been given his marching orders. The win moves Feyenoord three points behind leading duo PSV Eindhoven and FC Twente, with NAC a distant ninth.
FC Groningen earned only their second win of the season as Danny Holla's first-half free-kick gave them 1-0 victory over Vitesse Arnhem.
Koen Van de Laak missed a late penalty for the hosts but it made no difference to the final result as Vitesse had already wasted a couple of good chances to equalise.
Heracles Almelo held on during a tense finale at NEC Nijmegen to finally get back to winning ways. Everton headed the hosts in front in the ninth minute and their advantage was doubled in the 24th thanks to Bas Dost.