Feyenoord moved up to second in the Eredivisie with a 5-1 thrashing of FC Twente at De Kuip.
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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.
Feyenoord's Sven van Beek scored perhaps the funniest own goal of the weekend in their 1-0 defeat to Den Haag.
Ajax and Feyenoord both recorded 3-1 victories on Sunday to remain locked together at the top of the Eredivisie.
Feyenoord's Dirk Kuyt his second hat-trick in two games as they beat AZ Alkmaar 3-1 in the Eredivisie.
Watch as former Liverpool hero Dirk Kuyt scored three goals in the first 39 minutes of Feyenoord's win at Heerenveen.
Gaston Pereiro was PSV Eindhoven hero as he scored twice in a 2-1 win against previously-unbeaten Eredivisie leaders Ajax.
Feyenoord moved up to second in the Eredivisie with a 2-0 victory over PEC Zwolle while FC Twente ended their winless start.
Ajax returned to the top of the Eredivisie with a 2-0 victory over Excelsior on Sunday.
Wout Weghorst scored the only goal as high-flying Heracles beat ADO Den Haag 1-0 to climb to second in the Eredivisie.
Ajax's Anwar El Ghazi scored twice in a 4-0 win over ADO Den Haag that took them clear at the top of the Dutch league on Sunday.
Feyenoord forward Dirk Kuyt is back 'home' in Rotterdam and searching for silverware.
There were wins for Ajax and Feyenoord in the Eredivisie on Sunday, while FC Twente slipped to defeat.
Feyenoord and Roda JC secured opening day victories in the Eredivisie.
Dutch winger Eljero Elia has joined Feyenoord on a two-year deal, leaving Werder Bremen after three seasons.
Ronald Koeman returned to Feyenoord as Southampton ran out 3-0 winners in the pre-season friendly at De Kuip
Southampton have signed Dutch midfielder Jordy Clasie on a five-year deal from Feyenoord.
Southampton are in talks with Feyenoord over the potential signing of Netherlands midfielder Jordy Clasie.