Heerenveen made it five games without defeat as they drew at Vitesse Arnhem, while FC Dordrecht grabbed an away point.
Middlesbrough have completed the signing of Yanic Wildschut from Heerenveen for an undisclosed fee.
Cambuur Leeuwarden beat ADO Den Haag 3-2 in the Eredivisie, while AZ Alkmaar grabbed a 3-1 win over FC Dordrecht.
Heerenveen claim they have been approached by Middlesbrough over winger Yanic Wildschut.
Willem II beat AZ 3-0 for their first points of the Eredivisie season on Saturday, while Heerenveen also won.
Feyenoord's bid to start the campaign with back-to-back wins was frustrated by 10-man Heerenveen as they were held 1-1.
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