PSV battled back to snatch a 2-2 at Heerenveen thanks to Donyell Malen's goal in the fifth minute of stoppage time.
Feyenoord missed the chance to make ground on the Eredivisie top two after losing 3-1 at PEC Zwolle on Saturday.
PSV Eindhoven opened up a five-point gap at the top of the Eredivisie following a comprehensive 4-0 victory at nine-man Heracles Almelo.
Third-placed Feyenoord maintained their five-point cushion over the chasing pack with a 1-0 win at struggling Groningen in Eredivisie.
Ajax kept the pressure on Eredivisie pace-setters PSV Eindhoven with a comprehensive 7-1 victory over Excelsior at Stadion Woudestein.
Ajax took advantage of Jeremiah St Juste's early dismissal to record a 3-0 win against Feyenoord in the Eredivisie on Sunday.
PSV Eindhoven hit Emmen for six to make it nine wins from nine at the top of the Eredivisie.
Ajax built on their midweek Champions League draw with Bayern Munich by reclaiming second place in the Eredivisie with a 5-0 win over AZ Alkmaar.
Robin van Persie scored a late winner and was then sent off as Feyenoord kept pace with second-placed Ajax in the Eredivisie with a stormy 2-1 win over Vitesse.
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.
Hibernian produced a second-half comeback to seal a 3-2 win against Asteras Tripoli in the first leg of their second round Europa League qualifier on Thursday.
ADO Den Haag and Heerenveen will join Vitesse and Utrecht in the play-offs for the last Europa League spot despite mixed fortunes on the final day.
Former Eredivisie champions FC Twente have been relegated from the league after a thumping 5-0 defeat at Vitesse on Sunday.
Jorrit Hendrix's impressive late strike earned a point for Dutch champions PSV Eindhoven in a 2-2 draw against Roda.
PSV hit back from two goals down to win 3-2 at AZ Alkmaar and extend their lead at the top of Eredivisie to 10 points.