Michael Harriman gave the visitors a 12th-minute lead, before goals either side of half-time from Leon Maloney (39 minutes) and Marcus Harness (62) hand the Blues victory.
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13. Leon Maloney
Pompey v Northampton second half in Leasing.com Trophy Picture: Sean Ryan | JPIMedia Photo: Sean Ryan
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14. Brett Pitman
Pompey v Northampton second half in Leasing.com Trophy Picture: Sean Ryan | JPIMedia Photo: Sean Ryan
15. Andy Cannon
Pompey v Northampton second half in Leasing.com Trophy Picture: Sean Ryan | JPIMedia Photo: Sean Ryan
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16. Leon Maloney
Pompey v Northampton second half in Leasing.com Trophy Picture: Sean Ryan | JPIMedia Photo: Sean Ryan
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