Pompey's run of poor form continued as they were beaten at home by fellow promotion hopefuls Sunderland.
Goals from Charlie Wyke and Jordan Jones ensured the Black Cats inflicted a 2-0 defeat on the Blues, who remain sixth in the League One standings.
The best chance for Kenny Jackett's side came when Tom Naylor linked up with Ryan Williams and sent in a dangerous ball that John Marquis could not quite get on the end of.
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