Ajax moved three points clear at the top of the Eredivisie table after a 4-2 home win against Vitesse Arnhem.
PSV Eindhoven's Eredivisie title chances were dealt a blow as they had to settle for a 3-3 draw away at 10-man Vitesse.
Luuk De Jong scored his 21st league goal as PSV pulled eight points clear at the top with a 2-0 win over bottom side NAC Breda.
Robin van Persie scored a hat-trick as Feyenoord won 4-0 at home against FC Emmen in the Eredivisie on Sunday.
PSV battled back to snatch a 2-2 at Heerenveen thanks to Donyell Malen's goal in the fifth minute of stoppage time.
West Ham have rejected an offer from Dutch club Heerenveen to take Reece Oxford on loan until the end of the season.
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