Jack Diamond’s 94th-minute effort sealed the win for the League Two side, after Luke Armstrong’s 44th-minute opener for the visitors was cancelled out by Ellis Harrison (45+2).
The defeat sees Pompey’s six-match winning run end and the Blues absent from Monday night’s third-round draw…
Here’s how our chief sports writer rated the players’ individual performances...
5. Mahlon Romeo - 6
Disappointing afternoon when in possession in attacking positions and caught out for the winner. Photo: The News
6. Shaun Williams - 5
At fault for first goal and took many times was laboured and caught in possession. Photo: The News
7. Miguel Azeez - 5
In and out of proceedings, fading in second half. Didn’t take his rare first-team chance. Photo: JPIMedia
8. Reeco Hackett - 7
(Replaced by John Marquis on 75 minutes): Put some excellent first-half crosses in and big improvement on last week. Photo: The News