In-form Vitesse boosted their top-three hopes with another Eredivisie win as AZ were beaten 3-1 on Friday.
Vitesse racked up a seventh victory in eight Eredivisie matches with a 3-1 win over AZ on Friday.
Chelsea loanee Bertrand Traore's fifth goal in six games put the hosts ahead after seven minutes, only for Steven Berghuis to level almost immediately.
Marko Vejinovic's 73rd-minute penalty restored Vitesse's advantage and Jan-Arie van der Heijden rounded off the scoring in stoppage time.
AZ stay fourth, while Vitesse climb to fifth - three points behind their opponents and four off third spot, which offers automatic qualification for the UEFA Europa League.