The side defeated Zambia 59-47 in their third game at the Gold Coast Sports & Leisure Centre yesterday.
As in their last two games, the Tongans began their lead from the first quarter 18-8, before extending their lead to 31-24 in the second quarter.
The side stayed in the lead in the third quarter 44-35.
Tonga will now meet Samoa in the fourth round of the competition tonight.