Pompey failed to build on a positive start at New York Stadium, as they fell to a heavy defeat against Rotherham.
Michael Smith's opener came against the run of play, but Marcus Harness drew Danny Cowley's side level early in the second half.
But a goalkeeping error allowed Smith to net again and the visitors then capitulated, with Richard Wood and Ben Wiles completing a 4-1 win for the Millers.
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