Trailing by 22 points after 19 minutes, the Wallabies scored 38 unanswered points for a first victory over the Springboks in the South African economic capital since 1963.

Early leader Alex (Ducati-Gresini) was second in the 14-lap race with Pedro Acosta (KTM) completing the podium.

Villa finally tested Newcastle keeper Nick Pope through Boubacar Kamara's header immediately after the interval.

A sell-out crowd is expected at the iconic venue for what is undoubtedly the season's biggest fixture thus far.