South Africa kicked off their Rugby's Greatest Rivalry warmup with a match against Argentina in Buenos Aires - but it was less than smooth sailing for the World Champions. Both sides were short on their regular starters, with many new faces appearing in the lineups, but it was the hosts who seemed to fair better as they brought a serious physical challenge to the Webb Ellis Cup holders. A gruelling 80-minutes in the Argentine capital saw the game be decided by just one score as the Boks were able to courages hold firm against a surging Pumas outfit. #Rugby #Highlights #SouthAfrica #Argentina #RugbyUnion #RugbysGreatestRivalry SUBSCRIBE to World Rugby on YouTube! Keep up-to-date on all things rugby by following World Rugby on social media @WorldRugby