Vitesse Arnhem's bid to go top of the Eredivisie standings on Tuesday night was wrecked as AZ Alkmaar claimed a 2-0 win at the GelreDome.
A victory would have sent Vitesse a point clear of leaders Ajax but Peter Bosz's side, who had failed to win their previous two matches as well, were left empty-handed as AZ claimed only their third away win in 11 attempts this season.
An own goal from Vitesse's on-loan Chelsea defender Patrick van Aanholt put AZ ahead in the 20th minute and Aron Johannsson sealed the win three minutes before half-time.
Feyenoord, in fourth, are now just two points behind Vitesse after earning a 2-1 win at relegation-battling Roda JC.
First-half strikes from Lex Immers (13) and Samuel Armenteros (45) set Feyenoord on their way and, although they were made to sweat after Roda pulled a goal back 13 minutes from time through Anour Kali, the visitors held on for the spoils.
In Tuesday's other match, rock-bottom ADO Den Haag crashed to a fifth defeat in six games and 14th in total this season after going down 3-0 at home to Heracles Almelo.
Bryan Linssen gave Heracles a flying start with the opening goal after just two minutes and Mark Uth wrapped up the points with a brace, netting in the 34th and 57th minutes.