World Superbike champion Jonathan Rea claimed victory ahead of Chaz Davies in San Juan on Sunday.
The Northern Ireland racer had secured a record fifth straight World Superbike title at Magny-Cours last month and produced another confident display during the penultimate round in Argentina.
The Kawasaki rider had won Sunday's Superpole 10-lap sprint and recovered from briefly losing the lead of the final race to Alvaro Bautista.
Rea then consolidated his advantage during the closing stages to finish over five seconds ahead of Welshman Davies, who left himself too much to do following a poor start.
Toprak Razgatlioglu was third for Puccetti, while Spaniard Bautista had to settle for fifth, having won Saturday's opening race.
Ducati rider Bautista had claimed the first 11 rounds this season to lead the standings by 61 points.
The Spaniard, though, crashed out in four consecutive rounds as Rea mounted his challenge towards another world crown.
The 2019 season will conclude in Qatar on 25 and 26 October.