Yuki Kobayashi fired a second-half winner as Heerenveen climbed top of the Eredivisie table with a 2-1 victory at Willem II.
Sparta Rotterdam 'keeper Roy Kortsmit went from hero to villain and back again as he saved the same penalty twice against AZ Alkmaar.
Wout Weghorst recovered from a double penalty miss to shoot AZ Alkmaar joint top of the Eredivisie with a 2-0 win at Sparta Rotterdam.
Heerenveen secured a surprise 2-0 home win over 10-man PSV Eindhoven on Sunday.
Ajax suffered an opening-day defeat in the Eredivisie after losing 2-1 at Heracles.
Jurgen Locadia did Eredivisie leaders Feyenoord a favour by firing PSV Eindhoven to a 1-0 win over the Rotterdammers' title rivals Ajax.
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