Pompey suffered final day heartache, as they were beaten at home by Accrington to miss out on a League One play-off spot.
The 1-0 defeat ensured that it was Oxford who claimed that all-important sixth spot, while the Blues ended up in eighth position.
Adam Phillips netted the only goal midway through the first half and although Danny Cowley's men improved after the break, they could not find a way past a resolute Stanley defence.
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