The Blues proved too hot to handle for their Fratton Park visitors as Colby Bishop, Ronan Curtis, substitute Michael Jacobs and Connor Ogilvie cancelled out Joe Ironside’s 30th-minute opener.
The wins means Pompey remain unbeaten in all competitions and move up to third in the League One table.
Here’s how Mark McMahon rated the players’ performance on a pulsating night of action under the lights at PO4.
5. Connor Ogilvie - 8
Had a real battle on his hands against Sam Smith but came out on top, especially when he scored Pompey’s fourth. Photo: National World
6. Owen Dale - 7
(Replaced by Reeco Hackett on 72 mins): Can be happy with his full league debut. Looked lively. Photo: NationalWorld
7. Tom Lowery - 6
(Replaced by Louis Thompson on 63 mins): Put a real shift in on first start. Photo: NationalWorld
8. Marlon Pack - 9
(Replaced by Jay Mingi on 89 mins): Is such a presence in the middle of the park for the Blues. A real tower of strength. Deserved standing ovation. Photo: NationalWorld