Pompey’s trip to Oxford on Monday is a one-off match to decide who will head to Wembley for the League One play-off final.
With the away goals rule not used, Friday evening’s 1-1 draw at Fratton Park can essentially be discounted.
The hosts dominated that contest for long periods, without really being able to test keeper Simon Eastwood – although they did have several good penalty shouts controversially discounted.
And Kenny Jackett believes that a similar showing at the Kassam Stadium will be enough to secure progress.
The Blues boss said: “It’s very evenly poised and we have to recover now because we want to be the fitter team if we can.
“I don’t think there was too much wrong with what we did on Friday and so we’re looking for more of the same.
“The best side on the day usually wins and I always felt it was going to be a close contest between two sides who finished the season on 60 points.
"It’s very evenly poised and we have to recover now because we want to be the fitter team if we can."
“We were in on Saturday and Sunday to prepare for the game and make sure that everyone’s ready for it.
“It’s only an hour or so to Oxford and that’s good for us – it’s not like having to go all the way to Sunderland last season.
“We have to be physically and mentally prepared, as well as seeing what we can learn tactically from the first game.”
Pompey missed the vociferous backing of the Fratton faithful on Friday, but Jackett knows that United will be similarly penalised in the second leg.
He said: “Oxford’s been a very positive place in recent seasons and they’ve got an impressive home record, but – like it was for us – they won’t have that usual support.
“The crowd advantage would have obviously kicked in for us in the first leg and now it’s the same situation for them.
“Looking at results elsewhere in recent weeks, there hasn’t been much to suggest there’s home advantage.”