AFC Wimbledon boss Neal Ardley was baffled to see his team leave the south coast empty-handed after Portsmouth ground out a 1-0 win.
Pompey collected their first home triumph since Boxing Day after Ryan Taylor bravely met Daniel Alfei's cross from the right with a looping header in the second half.
Ardley said: "They're the home team and I can't remember them creating anything. I know they scored the goal and had a shot from long range in the first half.
"It was as comfortable as you can be away from home in one way, but without winning the game obviously.
"I told the players to be wary because the only way we could see them scoring was if we dropped into our box and a cross came in. I wish I didn't say things at half-time because the opposite seems to happen.
"It's the sort of mistakes they don't make at the top. It leaves you chasing the game and that's hard."