Pompey saw off Bristol Rovers at the Memorial Stadium to secure their second away win of the week.
The prolific Colby Bishop did the damage by finding the net in each half to secure a 2-0 victory.
He opened the scoring for John Mousinho's men with an angled finish, then added a penalty following a foul on Paddy Lane.
The hosts ended the contest with just 10 after Jarell Quansah hacked down Joe Morrell and then appeared to headbutt the midfielder.
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