Pompey left it late to secure a dramatic Papa John's Trophy triumph at Exeter.
George Hirst had given Danny Cowley's side an early lead in Devon, only for Matt Jay to immediately equalise.
Archie Collins then looked to have booked the Grecians a spot in the last 16 before substitute Ronan Curtis bagged a late brace.
The 3-2 victory means that the Blues will now travel to Cambridge in the next round on Tuesday evening.
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