Destiny Ojo scored his second goal in as many days to secure a narrow friendly victory for Pompey at Havant & Waterlooville.
The teenage forward converted Harvey Laidlaw’s superb cross just before the break to settle what was a largely uneventful contest.
John Mousinho made 11 changes from the side that started the previous evening’s 3-1 victory against Gosport.
All the fully fit senior players absent at Privett Park were given a run out, with Ryley Towler borrowing the captain’s armband from Marlon Pack.
Several players carrying slight knocks were not risked on the home side’s artificial surface as a precaution.
Plenty of supporters squeezed through the turnstiles to support the side and although the rain from Friday night was initially absent, it was a blustery afternoon.
The first half was a quiet – often laborious – affair, with both sides struggling to carve out any clear-cut opportunities.
Hawks keeper Ross Worner did have to come racing off his line in the opening stages, however, to prevent Ojo racing on to Paddy Lane’s threaded pass.
At the other end, Roarie Deacon eyed up a free-kick in a dangerous position, but could only send the ball flying into the wall.
Pompey were struggling to cope with their opponents’ high line and were caught offside on a number of occasions.
But just when it looked like the sides would troop in level at the break, the visitors managed to break the deadlock.
It came from an excellent left-sided cross from Laidlaw, which was converted by a diving header from academy team-mate OJO.
Half Time: Hawks 0 Pompey 1
Josh Oluwayemi came on at the start of the second half, replacing teenager Toby Steward between the sticks.
The keeper soon saw Ansu Janneh lob the ball just past the post after Worner had launched a long kick right down the middle.
The healthy crowd of 4,250 were soon sent scurrying for cover as a storm broke and sent rain lashing down.
And the Pompey players were then in a thunderous mood after Jake McCarthy caught Harry Jewitt-White with a late challenge.
The expected influx of substitutes arrived just past the hour mark and left the visitors with a much more youthful look.
Sam Folarin was one of the players introduced from the bench and he had the ball in the back of the net on 70 minutes, only to be denied by an offside flag.
A trialist soon had a chance to draw the Hawks level at the other end, but directed his header straight at Oluwayemi.
Liam Vincent then saw his penalty appeals waved away by referee Matt Russell after being sent tumbling to the turf inside the area.
Former Blues youngster Dan Gifford – on trial with the Hawks – almost levelled right at the death, but Oluwayemi saved at point-blank range, as Pompey registered another pre-season win.
Hawks (3-4-3): Worner; McNerney, Willson, Oastler (c); Stanley, McCarthy, Janneh, Innocent; Deacon, Faal, Blair
Subs: Kealy, Roberts, Baker, Parnum, Gifford, Trialist A, Trialist B
Pompey (4-3-3): Steward (Oluwayemi 46); Swanson (Quarm 63), Mnoga (Bosaka 63), Towler (c) (Fox 63), Sparkes (Vincent 63); Jewitt-White (Keteku 63), Stevenson (Aston 63), Murray (Clout 63); Lane (Mottoh 54), Ojo (Folarin 63), Laidlaw
Goals: Ojo 43
Sub not used: Hume
Referee: Matt Russell
Attendance: 4,250