PSV Eindhoven left the door ajar for Ajax as they could only draw 1-1 at NAC Breda.
Ajax thrashed PSV before the international break to open up the title race and PSV's failure to win on Saturday means the Amsterdam giants can cut the lead at the top to three points on Sunday.
Arne Slot fired NAC ahead on 62 minutes, but PSV rallied and Jefferson Farfan secured a point for the Eredivisie leaders with a strike on 74 minutes.
AZ Alkmaar took advantage of Ajax's absence from Saturday's fixture list to climb into second thanks to a 2-0 win over RKC Waalwijk.
Former Rangers striker Shota Arveladze fired AZ ahead on 24 minutes and Julian Jenner condemned struggling RKC to their 18th defeat of the season when adding a second 13 minutes from time.
Willem II eased their relegation fears with a 1-0 win over NEC Nijmegen. Anour Hadouir scored the only goal on 23 minutes.