Cheslin Kolbe, hooker Malcolm Marx and Jesse Kriel also crossed for tries as the hosts bullied Argentina in the scrum and ran the visitors ragged with the inventive backline play that they have introduced into their game this season.
Argentina’s only try came via fly-half Tomas Albornoz and they were not helped by yellow cards for wing Mateo Carreras and full-back Santiago Carreras, and a 20-minute red card for flanker Pablo Matera as they lost their discipline under pressure.
There was double cause for celebration as lock Eben Etzebeth became the most-capped Springbok with his 128th appearance, one more than Victor Matfield, while the world champions finished with 24 points in the table, eight more than New Zealand.
“I am lost for words, it has been a journey and a half and to bounce back from last week says a lot about our team,” Springbok captain Siya Kolisi said.
“I want to say to my best friend, Eben Etzebeth. You have always been by my side, you have led us as a team in so many ways. I am so proud of you. Cheers my brother, I love you.”
The Springboks selected Manie Libbok at fly-half but deferred his kicking duties from the tee to scrum-half Jaden Hendrikse, signalling their intention to run the ball.
And Libbok, who missed a late penalty in front of the poles last week as Argentina won 29-28 in Santiago del Estero, was the conductor for the Springboks, igniting the backline as they ran in seven tries.
South Africa bagged two of those tries early to settle any nerves as they kept the visitors penned in their own half. Fassi crossed after a backline move from the set piece saw him bash his way over near the posts, before Du Toit stretched over the top of a ruck to dot down and make it 14-0 in as many minutes.
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