Pompey dropped one place to sixth in the League One standings after being held to a draw by Oxford.
But the 1-1 stalemate did mean that Danny Cowley's side stretched their unbeaten run at Fratton Park to 18 matches.
Kyle Joseph gave the visitors the lead with a fine finish, but United had Billy Bodin sent off after the break and Colby Bishop soon levelled.
Fans can watch the key moments (top video) or register with iFollow for extended highlights (middle video) and a full match replay (bottom video).
Please note that if the full match replay is playing the wrong audio, you can use the settings cog to toggle between home and away commentary.
Apologies, this video is unvailable.