Ajax's Netherlands keeper Maarten Stekelenburg was at fault for the goal after his sloppy pass to Gregrory van der Wiel was intercepted by De Jong and the Twente forward calmly opened the scoring with a shot from a tight angle after eight minutes.
Champions Twente dominated the first half against the Dutch Cup winners and came close to doubling their lead when Theo Janssen hit the bar before Stekelenburg denied De Jong a second goal by keeping out his powerful header.
In a lacklustre second half Twente, coached by Steve McClaren's successor Michel Preud'homme, gave Ajax no chance to recover but also wasted opportunities to settle the match early.
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