Pompey played out a stalemate with Oxford – the fifth time in succession that a game between the sides has finished all square after 90 minutes.
Kenny Jackett's side looked comfortable after Sean Raggett headed them into the lead and created chances to score more.
But an alleged foul on Dan Agyei by Jack Whatmough allowed Alex Gorrin to make the score 1-1 from the spot.
Fans can watch the key moments (top video) or register with iFollow for extended highlights (middle video) and a full match replay (bottom video).
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