AZ Alkmaar took a grip of fourth place in the Eredivisie with a 2-1 win over ADO Den Haag.
PSV Eindhoven returned to the top of the Eredivisie table after a 3-0 success at Roda JC sealed a third straight win.
Feyenoord tightened their grip on third place and a Europa League qualification spot with a 1-0 win at FC Twente.
Marko van Ginkel scored twice as PSV returned to the top of the Eredivisie table with a 4-2 win at AZ Alkmaar on Saturday.
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Ajax won 2-0 at PSV Eindhoven to climb above their rivals to the top of the Eredivsie table on Sunday.
Eredivisie leaders PSV Eindhoven were held to a frustrating 1-1 draw by Heerenveen at Philips Stadion on Saturday.
Ajax closed the gap to Eredivisie leaders PSV Eindhoven back to a single point after thumping Willem II 4-0 on Sunday.
Eredivisie leaders PSV Eindhoven coasted to an eighth straight win to open up a four-point advantage over Ajax.
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.
PSV Eindhoven climbed to the top of the Eredivisie with a 4-2 victory over De Graafschap on Saturday.
PSV Eindhoven cut the gap on Eredivisie leaders Ajax to a single point with a 3-1 win at Excelsior.
PSV closed the gap to Ajax at the top with a 4-2 win over Twente, while AZ Alkmaar beat Feyenoord on Sunday in Eredivisie.
PSV Eindhoven edged out Zwolle 3-2 to move level on points with Eredivisie leaders Ajax.
Eredivisie leaders Ajax slipped to a 1-0 defeat at Utrecht on Sunday, while Feyenoord were held to a 1-1 draw at Groningen.
Besiktas and Ajax were eliminated from the Europa League while Borussia Dortmund finished second in their group.
Netherlands defender Ron Vlaar has agreed to rejoin AZ Alkmaar on a deal until the end of the season.
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.