Argentina ran in two late tries to see off Italy and record their first win since June.
The match in Florence was in the balance until Marcos Kremer and Joaquin Tuculet both crossed for converted scores to earn the Pumas a 31-15 victory.
Argentina wing Sebastian Cancelliere scored the only try of the first half to add to Juan Martin Hernandez's early penalty but Italy held a 9-8 lead at the break courtesy of Carlo Canna's three penalties.
Canna sent over another three-pointer after the restart and Marcello Violi slotted over a drop goal.
But Argentina hit the front through Nicolas Sanchez's third penalty and never relinquished that lead as they won for the first time in eight Test matches.
Italy: (9) 15
Penalty: Canna (13', 21', 33', 49')
Drop-goal: Violi (57')
Argentina: (8) 31
Try: Cancelliere (27'), Kremer (69'), Tuculet (77')
Conversion: Sanchez (70', 78')
Penalty: Hernandez (12'), Sanchez (46', 54', 60')