The match was played in Port Moresby this afternoon.
Tries to Yoks Bagave and Michael Yanis took the Vipers to an 8-0 lead after 15 minutes of play.
The Mendi boys hit back straight after the restart through a try from fullback Wesley Vali.
Vali successfully converted a penalty kick at goal just before half-time to leave the score at 8-6, in favour of the home side.
Points were hard to come by in the second half as both teams tried desperately to find the try line.
