After an uneventful first half, Pompey were able to put struggling Doncaster to the sword at Fratton Park.
Reeco Hackett, George Hirst, Aiden O’Brien and Sean Raggett all found the target to secure a comfortable 4-0 victory.
Danny Cowley was delighted with the way his side grew into the contest after a slow opening to proceedings.
And he felt that Pompey got their just rewards for being much braver with the ball following the interval.
The Blues boss said: “It’s a really good win. We had to fight hard in the first half, when we were a bit to risk averse.
“But we managed to find a bit of rhythm towards the break and our message to the players was then just to free themselves up a little bit.
“We wanted them to be more courageous on the ball because we picked an attacking and technical team.
“That’s what happened and you saw more of a flow to our performance, particularly when we scored the second goal. You could see a confidence that perhaps hasn’t been there.
"We wanted them to be more courageous on the ball because we picked an attacking and technical team."
“We knew that Doncaster conceded a lot of goals from crosses, and so we wanted two of our best people at that if we got into those advanced areas.
“Marcus and Reeco certainly have quality with their deliveries and I think three of our four goals came from balls into the box – either from open play or set-pieces.
“It's been a good week and after a good performance against the odds at Oxford and then digging in to beat Burton in midweek.
“In this game I thought the second half was the best we’ve played for a long time and it gave us a platform to build on.
“Things are coming together for us, but we’re still a work in progress and have to continue working hard.”
O’Brien netted just a few seconds after entering the pitch in place of Michael Jacobs for his home debut.
Cowley said: “It was a great introduction for him to score with his first touch after some great play from Marcus and Ronan.
“I’m also pleased that Sean has got going because our set-piece delivery has improved significantly and we look a real threat.”