Pompey returned to winning ways after finally breaking down a stubborn Burton side in stoppage-time.
Dane Scarlett netted the only goal of the game after Joe Pigott had nodded Connor Ogilvie's cross into his path.
John Mousinho was also able to welcome Joe Rafferty back into the side following a long injury lay-off.
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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