Pompey saw off League Two side Crawley in their latest pre-season friendly.
They won 2-1 at Broadfield Stadium just a week before the new League One campaign begins at Shrewsbury.
Gareth Evans dived to head home a Marcus Harness delivery and open the scoring, with Tom Naylor doubling the lead after the break.
A fierce strike from Mason Bloomfield reduced the hosts' deficit late on, but they never looked like finding an equaliser.