Dirk Kuyt scored twice as Feyenoord came from behind against Excelsior to maintain their 100 per cent Eredivisie record.
Ajax moved a step closer to reclaiming the Eredivisie title on Sunday with a thumping 4-0 win over FC Twente.
PSV Eindhoven returned to the top of the Eredivisie table after a 3-0 success at Roda JC sealed a third straight win.
De Graafschap moved off the bottom of the Eredivisie table after a 3-0 home win over Roda JC on Friday.
Ajax beat Excelsior 3-0 to close the gap at the top of the Eredivisie on Sunday, while Dirk Kuyt was on target for Feyenoord.
AZ Alkmaar climbed up to fourth in the Eredivisie after beating Heracles 6-2 to maintain their perfect start to 2016.
FC Twente came from behind to beat 10-man Heerenveen 3-1 in the Eredivisie on Saturday, as AZ and Heracles also won.
Ajax blew the chance to go back to the top of the Eredivisie after conceding a stoppage-time equaliser against Roda.
Ajax extended their gap at the top of the Eredivisie with a narrow 1-0 victory at home to Vitesse on Saturday.
Dirk Kuyt's impressive scoring form continued for Feyenoord on Sunday as the Rotterdam club beat Heracles Almelo 3-0 at home.
Michiel Kramer scored a hat-trick as Feyenoord won the Rotterdam derby 4-2 at Excelsior to move level with leaders Ajax,
Davy Klaassen scored twice as Ajax Amsterdam trounced SC Cambuur 5-1 to extend their lead at the top of the Eredivisie.
Eredivisie leaders Ajax hammered Roda JC 6-0 to open up a three-point gap at the top of the table.
PSV Eindhoven and Heracles maintained their pressure on the Eredivisie's top two with late away wins on Saturday.
Alireza Jahanbakhsh was NEC Nijmegen's hero with a two-goal haul helping to beat Ajax, condemning Roda JC to the drop.
Ajax clinched their fourth successive Eredivisie title with a 1-1 draw against Heracles Almelo on Sunday.
Roda JC's place in the Eredivisie's bottom three was confirmed on Saturday as they fell to a 3-0 defeat to FC Twente.
Feyenoord lost more ground on the Eredivisie leaders after being beaten 2-1 at home by Heerenveen - their fourth straight defeat.
Ajax still have work to do to wrap up their Eredivisie title defence following a 1-1 draw at Vitesse.
Ajax returned to winning ways with a 3-0 home victory over FC Twente while Feyenoord thumped Go Ahead Eagles 5-0.