OXFORD City stunned Peterborough United 3-1 to reach the third round of the FA Youth Cup.
City trailed at the break to a Jack Gurney strike and could have been two goals down if not for goalkeeper Jake Pritchard saving a penalty.
But they turned the match on its head after the break, with goals from Ahmed Farah and Sami Khawaja, before Horatio Hirst completed their unlikely victory late on.
City travel to Gillingham in the next round.
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