The bronze playoff kicked off at 4pm at the National Football Stadium under fine weather conditions in front of a sold out Port Moresby crowd.
Both teams remain scoreless at half-time.
Japan, in white and blue uniform, had more ball possession and made more attempts than their opponents.
The Asian side is led by top goal scorer and captain forward, Yuka Momiki.
USA, in black and blue, are led by captain Mallory Pugh.
USA's backline struggled in the first half to keep Japan away from the penalty box. However, the Asian side pushed for more attempts towards water break at 30 minutes into the game.
The Japanese put more pressure on the USA side with more attempts towards the end of the second-half.
Despite three minutes’ additional time, both teams failed to put a mark on the scoreboard.
Meantime, the final between France and Korea DPR will kick off at 7.30pm.