Nicolai Jorgensen netted a brace as Eredivisie leaders Feyenoord thrashed city rivals Sparta Rotterdam 6-1 at De Kuip.
PSV Eindhoven remain third after only drawing 0-0 at Willem II on Saturday, while Excelsior, Heracles and Groningen all won.
PSV Eindhoven extended their unbeaten Eredivisie run to six games but were held to a 1-1 draw against FC Twente.
Hakim Ziyech's strike was enough as Ajax edged Excelsior with a 1-0 win to keep the pressure on Eredivisie leaders Feyenoord.
PSV Eindhoven closed the gap on second-placed Ajax to just a point with a 1-0 win over Sparta Rotterdam at Philips Stadion.
Feyenoord maintained their winning start to the Eredivisie season at Willem II, while there was also a win for Ajax.