AMSTERDAM (AP) Feyenoord lost 1-0 to 10-man ADO The Hague on Sunday to slip three points behind Eredivisie leader Ajax in the Dutch top flight.
A 69th-minute own goal by Sven van Beek handed ADO only its second league win of the season and Feyenoord its second defeat.
ADO forward Edouard Duplan was sent off in the 82nd minute, but Feyenoord could not turn its brief numerical advantage into goals.
Ajax - beaten by Feyenoord in the cup midweek - thrashed Roda JC Kerkrade 6-0 on Saturday.
Viktor Fischer grabbed two goals and two assists for Ajax while midfielder Davy Klaassen and striker Arkadiusz Milik also both scored a brace.
Defending champion PSV Eindhoven beat last-place De Graafschap Doetinchem 6-3 to stay third.