The Australian made it the perfect start to life at Fratton Park, with the Blues heading for an opening-day defeat against Bristol Rovers.
Trailling to Luke Thomas’ first-half goal, Yengi rose at the far post to finished Joe Rafferty's right-wing cross and make it 1-1 in the 92nd minute in front of the Fratton faithful.
There were some eye-catching displays on show and here are our Pompey player ratings...
9. Tom Lowery - 5
(Replaced by Christian Saydee on 46 minutes) Utilised in a more advanced central midfielder role, but didn’t quite come off. Buzzed around and kept possession yet couldn't unlock anything. One good cross on stroke of half-time diverted wide by Colby Bishop’s knee. Booked. Photo: Jason Brown
10. Gavin Whyte - 6
(Replaced by Abu Kamara on 65 minutes) Disappointing first-half, struggling to get involved and often over-hitting or under-hitting crosses. But started the second half far better, drawing a decent save out of the keeper with a right-footed shot from outside the box and generally upping his game. Photo: Jason Brown
11. Colby Bishop - 6
Had a fitful pre-season without getting going and, as a result, wasn’t really on it against Bristol Rovers. In fairness, lacked decent service other than one difficult first-half chance which he instinctively kneed wide. Photo: Jason Brown
12. Anthony Scully - 7
(Replaced by Kusini Yengi on 83 minutes) The brightest of the attacking three who started the game and corner delivery far better than previous Saturday against Bristol City. Had some good moments but couldn’t open anything up. Photo: Jason Brown