Davy Klaassen scored twice as Ajax Amsterdam trounced SC Cambuur 5-1 to extend their lead at the top of the Eredivisie.
Ajax maintained their three-point advantage over Feyenoord with a 1-1 away draw on Sunday, as PSV Eindhoven jumped into second spot.
Feyenoord lost ground in the Eredivisie title race after a shock 1-0 loss against ADO Den Haag.
Ajax and Feyenoord both recorded 3-1 victories on Sunday to remain locked together at the top of the Eredivisie.
Nigel Hasselbaink hit a 92nd-minute equaliser to earn Excelsior a 1-1 draw against PSV Eindhoven on Saturday night.
Gaston Pereiro was PSV Eindhoven hero as he scored twice in a 2-1 win against previously-unbeaten Eredivisie leaders Ajax.