The Springboks overcame an early red card to beat an impressive Portugal side 64-21 in a highly entertaining debut clash between the two nations in Bloemfontein.
Wandile Mlaba is set to make his SA U20 debut off the bench in Friday's final encounter of the World Rugby U20 Championship against Wales in Cape Town.
Springbok coach Rassie Erasmus revealed an anecdote about new captain Salmaan Moerat's commitment to the team.
Rassie Erasmus has stayed true to his word by fielding a completely new-look Springbok squad for Saturday's clash against Portugal in Bloemfontein.
The Junior Boks will play out for the seventh place in the World Rugby U20 Championship after going down 34-24 to Argentina in their fifth-place semi-final in Cape Town on Sunday.
Ireland rookie Ciaran Frawley revelled in his match-winning contribution after landing a last-gasp drop goal to stun world champions South Africa in Durban.