The Blitzboks beat Argentina 24-0 in their opening match of the Hong Kong Sevens on Friday.
Neil Powell's team led 12-0 at the break, courtesy of a try apiece from Cecil Afrika and Seabelo Senatla, with Branco du Preez adding one conversion.
The same scoring sequence followed in the second stanza, with Kwagga Smith crossing the tryline and Du Preez converting, before Werner Kok finished it off with the Blitzboks' fourth try.
South Africa will complete their pool fixtures against France and Japan tomorrow.
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