Pompey secured unlikely progress to the Papa John's Trophy knockout stages by beating Crystal Palace U21s at Fratton Park.
The 3-0 victory – coupled with defeat for AFC Wimbledon at Sutton – meant they snatched second spot from the Dons on goals scored.
Danny Cowley's side dominated throughout, with Miguel Azeez and Gassan Ahadme both on target before a crucial stoppage-time strike from George Hirst.
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