FC Twente moved to the top of the Eredivisie by thumping 10-man Groningen 5-0, while Heerenveen beat Cambuur Leeuwarden.
Holders AZ Alkmaar and 18-time winners Ajax survived scares to progress in the KNVB Beker with 4-1 and 4-2 wins.
FC Twente brought an end to their three-match winless run with a 3-0 victory at Heracles Almelo in the Eredivisie.
Three men were sent off as Heerenveen beat FC Groningen 4-2, while struggling Feyenoord salvaged a 3-3 draw at Nijmegen.
PEC Zwolle face the stiffest test of their season as they visit reigning Eredivisie champions Ajax on Saturday.
PEC Zwolle's 100 per cent winning start to the Eredivisie season ended after they drew 1-1 at home to FC Utrecht.
Feyenoord won 3-1 against NAC Breda while Utrecht secured all three points by beating AZ Alkmaar 2-0.
Marco van Basten will put his past with Ajax to one side when the champions visit the Abe Lenstra Stadion.
Three second-half goals saw PSV Eindhoven defeat Go Ahead Eagles and make it a hat-trick of wins in the Eredivisie.
Feyenoord will do everything possible to make sure Samuel Armenteros is available for their Eredivisie clash with Ajax.
Feyenoord lost 4-1 to FC Twente while Ajax went down 3-2 to AZ Alkmaar in Sunday's Eredivisie action.
Ajax's Viktor Fischer is delighted at the way the Eredivisie champions' coach Frank de Boer encourages him to play.
Liverpool forward Krisztian Adorjan hopes a loan spell with Dutch side Groningen will help his chances at Anfield.
PSV Eindhoven opened their Eredivisie campaign with a nervy 3-2 win at ADO Den Haag, while FC Groningen thrashed NEC.
Liverpool's young striker Krisztian Adorjan has joined FC Groningen on a season-long loan.
Groningen claim to have reached an agreement with Liverpool which will see Krisztian Adorjan head to Holland on loan.
Liverpool's Krisztian Adorjan is expected to link up with Groningen on loan after spending time training with the club.
FC Groningen have announced that Liverpool youngster Krisztian Adorjan is to spend a week on trial with them.
Celtic have completed the transfer of centre-back Virgil van Dijk from Dutch club FC Groningen.
Holland U21 defender Virgil van Dijk has arrived in Glasgow to put the seal on a move to Scottish champions Celtic.