Manuel Montero touched down three minutes from the end as Argentina came from behind to beat France 23-20 in the first Test in Cordoba.
After an early penalty from Morgan Parra, Belisario Agulla took advantage of Francois Trinh-Duc's wayward pass to cross and put the Pumas into a 7-3 lead.
But France stormed back and, thanks in part to a try from Louis Picamoles, Les Bleus led 14-13 at the break.
The sides traded penalties in a scrappy second half as France increased their lead to 20-16.
But Montero ran on to Joaquin Tuculet's kick in the closing minutes to give Argentina the win, helped by Felipe Contepomi's 13 points.
Argentina, who also beat Italy last weekend, will host France again in Tucuman next Saturday.
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