Argentina kept their lengthy unbeaten run against Scotland intact with a 21-15 win in Rosario on Saturday.
Fly-half Federico Todeschini kicked the winning points with a penalty five minutes from the end in a typically robust and tight encounter in Argentina's north, and Gonzalo Tiesi's late try made the game safe for the hosts.
Chris Paterson, starting at full-back, scored all Scotland's points at the Gigante de Arroyito stadium in Rosario to go four clear of Gavin Hastings as his country's all-time record holder.
By playing, he also equalled Scott Murray's record of 87 caps - but his efforts were not enough to subdue a Pumas side playing their first international since finishing third at the World Cup.
Tries: Tejada, Tiesi
Pens: Todeschini 3
Pens: Paterson 5
Argentina: 15 Bernardo Stortoni, 14 JosÃ© MarÃa NÃºÃ±ez Piossek, 13 Gonzalo Tiesi, 12 Felipe Contepomi (c), 11 TomÃ¡s De Vedia, 10 Federico Todeschini, 9 NicolÃ¡s Vergallo, 8 Juan Manuel LeguizamÃ³n, 7 Juan FernÃ¡ndez Lobbe, 6 MartÃn Durand, 5 Esteban Lozada, 4 Ignacio FernÃ¡ndez Lobbe, 3 Santiago GonzÃ¡lez Bonorino, 2 Ãlvaro Tejeda, 1 Marcos Ayerza.
Replacements: 16 Pablo Gambarini, 17 Juan GÃ³mez, 18 James Stuart, 19 Alejandro Campos, 20 Alfredo Lalanne, 21 Santiago FernÃ¡ndez, 22 HernÃ¡n Senillosa.
Scotland: 15 Chris Paterson, 14 Simon Danielli, 13 Ben Cairns, 12 Graeme Morrison, 11 Thom Evans, 10 Dan Parks, 9 Mike Blair (c),
8 Allister Hogg, 7 Johnnie Beattie, 6 Alasdair Strokosch, 5 Scott MacLeod, 4 Matt Mustchin, 3 Euan Murray, 2 Ross Ford, 1 Allan Jacobsen.
Replacements: 16 Dougie Hall, 17 Allister Dickinson, 18 Alastair Kellock, 19 Kelly Brown, 20 Rory Lawson, 21 Phil Godman, 22 Simon Webster.
Referee: Alan Lewis (Ireland)
Touch judges: Alain Rolland (Ireland), Cobus Wessels (South Africa)
TMO: Shaun Veldsman (South Africa)