Pompey fell to their third league defeat on the spin at Southend today.
Two second-half goals from and Barry Corr and Shaquile Coulthirst made the difference at Roots Hall.
The Blues created little in the way of clear opportunities across 90 minutes against Phil Brown’s side.
That led to a defeat they could have little argument with.
The first half was, frankly, totally forgettable.
Neither team could get a foothold on proceedings, with little made in the way of chances.
Danny Hollands fired at Daniel Bentley from the edge of the box after six minutes.
New boy Jerome Williams then headed over from 10 yards three minutes later.
Jack Payne headed wide after beating Ricky Holmes in the air 10 minutes before the break.
But that was it in the way of chances for both sides.
Pompey started the second half in brighter fashion with Miles Storey angling a drive at Daniel Bentley.
Wallace then fired over from 12 yards after 54 minutes.
But the home side made the breakthrough two minutes later when Barry Corr nodded home a corner.
Hollands fired over 10 minutes later as Pompey looked to reply.
They couldn’t force their way back into the game, though.
They were then caught by a late sucker punch as sub Coulthirst broke and squirmed his shot past Paul Jones.
That leaves Pompey on 10 points after seven games in 10th place.