PSV emerged handsome winners in the De Topper derby by beating Ajax 3-0 at the Philips Stadion.
Feyenoord lost ground on the leading duo in the Eredivisie as they had to settle for a 1-1 draw at AZ Alkmaar on Sunday.
Ajax climbed into second place behind Eredivisie leaders PSV Eindhoven by thrashing Vitesse Arnhem 4-0 on the road on Sunday.
Fran Sol scored a hat-trick as Willem II thrashed the previously unbeaten Heracles Almelo 5-0 in the Eredivisie.
AZ Alkmaar continued to set a strong early pace in the Eredivisie after overwhelming FC Emmen 4-1 at De Oude Meerdijk.
The 2017 Eredivisie winners Feyenoord were shocked 2-0 by De Graafschap in their first game of the new league season.
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