MK Dons have beaten AFC Wimbledon 2-1 in the grudge match in the FA Cup second round.
The winner came in added time at Stadium MK through Jon Ostemobor.
Stephen Gleeson opened the scoring for Dons before Jake Midson levelled for AFC.
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But Ostemobor popped up late on to break AFC hearts.
It will be a sore blow to AFC Wimbledon which was founded by angry Wimbledon fans ten years after the club moved to Milton Keynes.