Goals from Izale McLeod and Gabor Gyepes gave Portsmouth victory over struggling Yeovil, who have now lost six games in a row.
Pompey deservedly took the lead after 13 minutes when Wes Thomas provided for McLeod, who drilled home.
The hosts were awarded a spot-kick for Lee Williamson's challenge on Nathan Ralph, which Reuben Reid converted.
But Gyepes steered the ball past Marek Stech to snatch all three points as Portsmouth secured back-to-back wins.
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Yeovil Town manager Gary Johnson told BBC Somerset:
"We had one or two players out there who just didn't get involved when they needed to.
"We know who they are and at this point we can see the ones we need to bring out the side.
"At the moment it's going to be quite a big job.
"We're going to have to be a little bit patient."
Portsmouth manager Michael Appleton told BBC Radio Solent:
"In the first half we were very good, we created numerous opportunities. I told them at half-time not to go and lose the second half.
"I've seen him [youngster Adam Webster] in training and his left foot is as good as his right foot at times. He was clever enough and brave enough to beat three or four players and let one go with his left foot and he was only a foot wide.
"I don't think he's [new signing Akos Buzsaky] quite right to start a game but if we get the opportunity to get him on for 20 or 30 minutes then it will stand us in good stead for the busy period."