Pompey Academy let slip an interval lead as they fell to a 5-3 defeat to Exeter in a Youth Alliance League contest at Cliff Hill.
It is the second high-scoring encounter of the season between the sides, following the Blues’ 6-5 victory on home soil back in September.
After falling behind in Devon, Alfie Stanley capitalised on a poor back-pass to fire the visitors back on level terms.
And a long-range drive from Gerard Storey was then deflected into the net to put Pompey into the lead.
Exeter hit back with an equaliser, but it was the Blues leading at the break, as Seokjae Lee (pictured) made space in the box before finding the bottom corner.
However, the second half belonged to the Grecians, who hit three unanswered goals to secure the points.
Professional development phase coach Liam Daish said: “We started very well, but conceded straight after going ahead, which was disappointing.
"We ultimately caused our own problems and made some very poor decisions at the wrong moments."
“It was a very open game at both ends of the pitch – just like the corresponding fixture at our place earlier in the season.
“But we ultimately caused our own problems and made some very poor decisions at the wrong moments.
“The stats will tell you where we need to improve. We look a good side going forward, but are vulnerable when we lose the ball.
“Now we need to reset, have a chat about where we can be better and get back to doing the basis well.
“The lads have to understand their roles and responsibilities, but we’re a competitive side and can beat anyone at our level.”
Pompey: Pitman; Kavanagh (c), Robb, Rew, Kelly; Storey (Jewitt-White 74), Bridgman; Lee (Anderson 65), Bell, Brook; Stanley