FC Twente remained on course for the Eredivisie crown by holding closest challengers PSV Eindhoven to a 1-1 draw on Saturday night.
Blaise N'Kufo, making his first start following injury, cancelled out Danny Koevermans' opener for PSV to keep Steve McClaren's men five points clear at the summit. Ajax can move above PSV into second if they beat RKC Waalwijk on Sunday.
Feyenoord's contest with Vitesse Arnhem was abandoned at half-time on Saturday night due to heavy rain in Rotterdam.
The Eredivisie match was finely poised at 1-1 when the referee called a halt to proceedings at the De Kuip. Ron Vlaar had fired the hosts into a 13th-minute lead and Wiljan Pluim had netted a 45th-minute equaliser.
Heracles' impressive season continued as they destroyed NAC Breda 3-0 at the Polman Stadion. The Almelo side went above AZ Alkmaar, who have yet to play this weekend, by one point through goals by Bas Dost, Willy Overtoom and Everton.
Willem II's hopes of retaining Eredivisie status suffered a blow as they went down to a comprehensive 3-0 defeat at home to FC Utrecht.
Jacob Mulenga capitalised on a defensive error to put the visitors ahead in the 14th minute and second-half goals from Jan Wuytens and Alje Schut made the points safe.
