Watch key moments from league victory
Conor Chaplin's first half header ensured that Pompey returned to winning ways at Cambridge.The teenager sent the ball looping over keeper Will Norris after meeting a deep cross from Christian Burgess.
But the Blues had to see out the final 30 minutes with just 10 men following Amine Linganzi's dismissal for a two-footed lunge.
Watch key moments from the game below or subscribe to Pompey PlayerHD for extended highlights.