The Fiji Airways Mens 7s side is safely through to the Cup semifinal of the Hong Kong 7s.
Fiji defeated Argentina in the quarterfinal by 29-24.
The Argentinians put up a brave first half performance to rattle Fiji as they led 17-12 at half time.
Captain Paula Dranisinukula scored a double in the first half.
Aminiasi Tuimaba, Meli Derenalagi and Terio Tamani crossed over for Fiji in the second spell.
A late try by Argentina was not enough as Fiji hung on to win.
Sevuloni Mocenacagi was shown a yellow after the final whistle for a shoulder charge.