Pompey were unable to make the most of their dominance as they fell to defeat at Cheltenham.
Although they were left angry by some controversial decisions by referee Simon Mather in the 2-1 reverse.
John Mousinho's men went ahead early in the first half, when Sean Raggett's pass was sliced into his own net by Tom Bradbury.
But Liam Sercombe then took advantage of some sloppy play at the back to net twice in quick succession for the Robins.
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