After effectively sealing a spot in the third round of World Cup qualifying with a 5-1 thumping of Chinese Taipei, the Socceroos will turn their focus toward topping their group and taking momentum into the next stage.
Australia now have a maximum 18 points from six games and a goal difference of +22 -- even if they let top spot slip they would be one of the four-best runners-up advancing to the 16-team next phase.
"Job done and two more games to go in this group," player of the match Duke said. "So we want to get maximum points and that's the main target for us."
Kenny Dougall and Riley McGree made their first starts in the green and gold while, in a feel-good story, defender Curtis Good started at left-back for his first cap since his 2014 debut -- with his international career previously derailed by hip flexor injuries.
"The performance was very good," Arnold said. "We had a very inexperienced team that was given an opportunity - only a couple of senior players around them.
"They handled everything really, really well."
Jamie Maclaren doubled Australia's lead from the penalty spot in the 27th minute after he was hacked down in the box.
In the 41st minute, McGree floated in a corner to the far post where skipper Trent Sainsbury comfortably headed home.
Less than a minute into the second half, Genreau burst forward and found Brandon Borrello, whose clever cross was well met by Duke at the near post -- for his first Socceroos goal since 2013.
The Aussies conceded off the back of sloppy defending in the 62nd minute.
Striker Nikita Rukavytsya made his first appearance since November 2017 in the 74th minute.
Ten minutes later, substitute Ajdin Hrustic dropped a clever ball to Rukavytsya who held his ground and cut the ball back for Duke to bury his second and round out the result.