Ajax climbed back up to second in the Eredivisie table with a 2-0 home win over Utrecht.
The Amsterdam giants have struggled to match strides with PSV Eindhoven this term, but they ensured the lead did not stretch over the weekend as they matched the champions' win from the previous day.
Both the goals came in the first-half, with Wesley Sneijder's strike on 21 minutes adding to an early effort from John Heitinga.
Feyenoord lost further ground on the leaders after being thumped at NAC Breda.
The Rotterdammers were on the back foot from the 11th minute when Sander van Gessel fired NAC ahead.
Mike Zonnelveld doubled the advantage before the break and a brace from Glen Salmon took the contest beyond Feyenoord who secured a consolation through Pierre van Hooijdonk.
Sparta increased the daylight between themselves and the drop zone with a 2-1 win over Excelsior.
Goals from Danny Schenkel and Haris Medunjanin sandwiched an effort from Eldridge Rojer to hand Sparta a vital three points.
Luis Suarez's brace was in vain as Groningen were beaten 3-2 at Vitesse Arnhem.
The forward proved to be in fine form for the visitors, but it mattered little as goals from Onur Kaya, Danko Lazovic and Fred Benson ensured the points remained at the Gelredome.