Kusini Yengi had not started a league game for Pompey before the win at Northampton just over a week ago.
But an injury to leading marksman Colby Bishop has given the summer signing an opportunity to shine in the side.
And it was one he grasped with a fine performance for the third tier leaders in their 2-0 victory over second-placed Burton.
Conor Shaughnessy opened the scoring with a header on the stroke of half-time and it was Yengi who converted a low Gavin Whyte centre late on to wrap things up.
The striker said: “It was a great game and we got the three points we needed to stay top of the table, so I enjoyed it.
“I had a few chances in both halves and then started to feel a bit of cramp, but knew that I just had to keep going.
"I went through into the box and Gav ended up putting the ball into the perfect position for me to get the tap-in."
“It was case of keep pushing because I really wanted that goal and had to make sure to put myself in the right areas.
“I went through into the box and Gav ended up putting the ball into the perfect position for me to get the tap-in.
“It was a massive result against a top team in the division and it’s going to propel us further towards promotion.”
Yengi also made one young fan’s night after the game by presenting him with a shirt following his media duties.
The Australia international said: “We were at a toy store last week to buy presents for the kids that we’re going to see when we do the Christmas hospital visits.
“I bumped into a little man who had a ‘Yengi’ kit on. He said he’d bring an Australian flag down to the game and asked if I could give him a shirt. I saw him afterwards and did exactly that.”