In the F1 event last week, Nam and Sun entered the semi-finals.
Nam will also play No 5 seed Franco Agamenone of Argentina in the first match of the singles category.
His teammate, Trinh Linh Giang, on February 18 failed to make the final round after one win and one loss in the qualification.
The tournament, played on clay courts, will provide prizes of 15,000 USD to the athletes. It will wrap up on February 26.