And yet again set-piece problems proved costly, with three goals coming from corners and another involving a quick free-kick in the build up as Arsenal capitalised in style.
Colby Bishop opened the scoring on three minutes after Conor Chaplin’s shot had been saved, but Arsenal soon roared back with an Andre Dozzell own goal following a corner.
Gabriel Martinelli added another, then missed from a few yards and then Noni Madueke missed a penalty in a lively first half which finished 2-1.
However, Arsenal controlled the game after the break, with Martinelli completing his hat-trick, while Harvey Blair and Franco Umeh both went off with fresh injuries.
And here are our Pompey player ratings...
13. Zak Swanson (22) of Portsmouth battles for possession with Ben White (4) of Arsenal during the FA Cup match between Portsmouth and Arsenal at Fratton Park, Portsmouth, UK on 11 January 2026.
Zak Swanson battles for possession with Ben White in Pompey's FA Cup clash. Picture: Graham Hunt/ProSportsImages Photo: Graham Hunt
14. Franco Umeh - 5
(Replaced Harvey Blair on 40 mins) Encouraging start, with Lewis-Skelly booked for pulling him back. But suffered what appeared to be a hamstring injury late on. Photo: Graham Hunt
15. Marlon Pack
(Replaced Le Roux on 62 mins) Tough match to step back into after injury, but handled himself well. Photo: Graham Hunt
16. Connor Ogilvie
(Replaced Conor Shaughnessy on 62 mins) Great to see him back after more than two months out. Played as left-sided centre-half. Photo: Graham Hunt