Some fans might have been fearing the worst when Pompey failed to make the most of their first half dominance against Oxford.
Several golden opportunities had been spurned at Fratton Park, including a tame penalty from Gareth Evans that was saved by Jonathan Mitchell.
But Kenny Jackett believed that his side would make their control count and was proved right after the interval.
Evans slotted the hosts in front and a Rob Dickie own-goal soon strengthened their advantage, while Jamal Lowe found the net either side of a United consolation.
And Jackett was delighted with how Pompey played overall in the 4-1 victory, although slightly disappointed with how they finished the contest.
The Blues boss said: “It was a strong performance and we dominated the majority of the game, which you always set out to do.
“Scoring four goals is fantastic – particularly at home because it got the crowd going. They were excellent efforts as well.
"I was always confident that the goals were going to come and they ultimately did during the second half."
“We were in control and played very well in the first half when compared with the Luton and Wimbledon games.
“There were some big chances and obviously Gareth had a penalty saved, while Tom Naylor and Oli Hawkins also missed opportunities.
“But I was always confident that the goals were going to come and they ultimately did during the second half.
“There were was a frustrating spell when their three substitutes came on and had a big effect on the game – probably too much of one.
“Oxford got the own-goal, but they possibly could have got more and that’s something we have to be aware of. There are aspects we still have to work on.
“That spell was out of keeping with the rest of the match and when that happens, you can’t let them have that many chances.
“Perhaps we got sloppy or ran out of energy, although overall it was a strong performance and we deserved the win.”
Ben Thompson impressed on his debut after being picked in midfield just a day after arriving on loan from Millwall.
Jackett said: “It was a good start for him and he’s someone I’ve liked for a little while now, so we’re happy to have him here.
“You always want to get off to a good opening and now he needs to back that up – he’s got the character to do that.”