Ajax moved three points clear of PSV at the top of the Eredivisie table after a comfortable 4-0 win over struggling Heracles at the Amsterdam ArenA.
Lasse Schone started the scoring after 13 minutes and it took until seven minutes after the break for Kolbeinn Sigthorsson to add a second.
Ajax could even afford to have Kenneth Vermeer sent off after 48 minutes as substitute Ryan Babel added a third with 15 minutes left.
The home side saved the best for last as Christian Eriksen's spectacular curling third in the closing minutes sealed the win.
Utrecht jumped above Heerenveen and into sixth after Jens Toornstra netted in the 71st minute against ADO Den Haag, while Heerenveen lost 3-1 at FC Groningen.
The visitors made the worst possible start when Jukka Raitala put through his own net after three minutes before a Leandro Bacuna spot-kick three minutes before the break extended their advantage.
Lukas Marecek pulled a goal back in the 70th minute but Michael De Leeuw sealed the win with three minutes left.
AZ are four points clear of the relegation zone after a 1-1 draw at NEC.
Adam Maher put the visiting side a goal up after 17 minutes but just two minutes later the hosts were level through Kevin Conboy.
Nick Van der Velden saw red for the home side after 61 minutes, but AZ could not force a winner.
On Saturday, PSV Eindhoven and Vitesse Arnhem both won to keep alive their title hopes.
PSV were 3-1 winners at bottom club Willem II.
Mark van Bommel opened the scoring on the stroke of half-time and despite Jordens Peters equalising in the 54th minute, the visitors wrapped up the points thanks to Ola Toivonen (76) and Timothy Derijck (82).
Vitesse continued their fine form with a 3-0 defeat of NAC Breda.
The prolific Wilfried Bony scored the first and last goals, with one in each half, and Renato Ibarra netted the second in the 50th minute.
FC Twente were 2-0 winners over Roda JC, with Luc Castaignos (44) and Nacer Chadli (56) on target.
Two of the sides hovering above the relegation places, PEC Zwolle and RKC Waalwijk, drew 1-1.
Florian Jozefzoon (seven) put RKC in front after seven minutes but Youness Mokhtar restored parity in the 21st minute.
On Friday night a solitary second-half goal by Graziano Pelle was enough to guide Feyenoord to a 1-0 victory over VVV Venlo.
Pelle struck with 19 minutes remaining as the hosts claimed their 19th win of the season.