They beat Guam last night by nine points at the BSP Arena.
Five minutes extra time was applied after both teams finished 72-all at full time.
Another five minutes extra time was given after the score was levelled again 81-81 after the siren went off.
Key players Betty Angula, Marca Muri and Nesta Sape helped PNG take the score up to 89-98 at the end of the second extra time.
To summarise the match, Guam was leading in the first quarter 21-17 and the second quarter 40-29 but PNG bounced back in the third quarter, 56-48.
PNG plays Nauru today, at 5pm.