Watch key moments from League Two loss
Pompey suffered just a fourth league defeat of the season after going down to Oxford at Fratton Park.Substitute Jordan Bowery grabbed the only goal late on, coolly finding the corner after collecting Jake Wright's pass.
Debutant Ryan Fulton had earlier kept out Liam Sercombe's penalty and then made a brilliant second save to stop the midfielder converting the loose ball.
Watch the key moments from the game below or subscribe to Pompey PlayerHD for extended highlights.