Japan and South Africa have met only once. They played in the opening match of Pool B in the 2015 Rugby World Cup, where in an upset Japan defeated two-time Rugby World Cup winners South Africa 34–32. The match is considered by many as the biggest upset in rugby union history.
Records
Note: Date shown in brackets indicates when the record was or last set.
References
History of rugby union matches between Japan and South Africa Wikipedia(Text) CC BY-SA