View the photos from the Blues' latest triumph at Fratton Park
Pompey extended their winning run to four games with a 2-1 home victory over Wigan.
Brett Pitman grabbed his 20th goal of the season from the penalty spot following a foul on Ben Close.
Jamal Lowe then turned and sent a neat shot into the bottom corner to double the hosts' advantage early in the second half.
Will Grigg reduced the deficit by converting a cross from former Fratton favourite Gary Roberts, but it proved a mere consolation.