Yeovil capitalised on two first-half defensive errors to beat Portsmouth.
The Glovers were ahead when Dominic Blizzard turned in a loose ball, after Pompey failed to clear Jamie McAllister's free-kick.
The lead was doubled in a similar fashion, as another McAllister set-piece was not dealt with, allowing Byron Webster to slot home.
Pompey reduced the arrears when Liam Walker's cross fell to Paul Benson to score, but they could not find another.
VIEW FROM THE DRESSING ROOM
Portsmouth caretaker manager Guy Whittingham told BBC Radio Solent:
"It was a nothing game really in the first half and we concede again from second phases of set pieces.
"I didn't think either team particularly played well, they played typical League One football where they put us under pressure from a lot of set pieces and we didn't help ourselves with the amount of free-kicks around the area and corners we gave away.
"The second half we tried to turn them a little more and be more positive and get forward earlier and everybody saw the difference.
"We are a team at the moment who, for some reason, we're not playing as a team, we keep striving for it, we keep looking for it, we keep asking the individuals about it, and no two ways about it, we've got to find that togetherness."