Meagen Gunemba’s two second-half goals, either side of Samoa having a penalty saved, secured the win after Charlie Yanding had given PNG a first-half lead.
While Samoa were intent on playing out from the back, Papua New Guinea were happy to press them in midfield, continuously winning the ball as a consequence.
Early chances followed for PNG, Gunemba heading over and Samoa goalkeeper Ronisa Lipi making a sharp save from Sonia Embahe.