The 21-year-old stopped the clock after 24.43 seconds to finish ahead of the Russian duo of Evgeny Rilov and current world record holder Kliment Kolesnikov.
A last gasp try from Herschel Jantjies allowed the Springboks to remain top of the southern hemisphere championship on seven points, one ahead of the All Blacks, with one match left for all four sides.
Buoyed by the Super Rugby success of the Jaguares, whose players make up a large majority of the squad, the Pumas will take on the Wallabies at Lang Park.