Pompey slipped to their first League One defeat of the season with a narrow reverse against Ipswich.
They had twice battled from behind to get back on level terms, only to end up being beaten 3-2 at Portman Road.
Colby Bishop bagged a brace of penalties for Danny Cowley's side to cancel out efforts from Marcus Harness and Freddie Ladapo.
But an unfortunate deflection off Connor Ogilvie saw the ball loop up for Wes Burns to head home the Tractor Boys' winner late on.
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