Argentina's Emiliano Boffelli scored a last-gasp try to snatch a dramatic 34-31 win and series victory over Scotland in the third Test.
Michael Cheika's men had to come from 15 points down to win the series at the Estadio Unico Madre de Ciudades.
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The pulsating decider ended in dramatic fashion when Argentina worked the ball out wide for Boffelli, who finished with 17 points, to dive over with the last move of the series following some sustained late pressure.
Scotland were 28-13 ahead early in the second half but allowed the hosts to recover and grab the win, restoring pride for the southern hemisphere countries after success earlier on Saturday for Ireland in New Zealand and England in Australia.
Argentina and Scotland each scored four tries with Boffelli contributing another 14 points with his boot.
Argentina's other tries were scored by Santiago Carreras, Nahuel Tetaz Chapparo and substitute scrumhalf Gonzalo Bertranou, whose opportunistic effort 13 minutes from time turned the Test in Los Pumas' favour.
Ewan Ashman and Duhan van der Merwe scored two tries each for Scotland with Blair Kinghorn adding four conversions and a penalty.
Argentina opened the scoring with an early Boffelli penalty, but Van der Merwe was first to cross over for a try, using his strength to power through the home defence after Kinghorn had created space in the 13th minute.
But on 20 minutes Argentina responded on the counterattack, turning over the ball and seeing Carreras outrun the tourists' defence to score.
Scotland had another try five minutes after that, with Ashman going over from a lineout maul for a 14-13 halftime lead.
Scotland, who had outscored Argentina four tries to nil in last week's 29-6 second Test win in Salta, looked odds-on to go on and secure the series as Ashman scored again, this time out on the wing, three minutes after the break.
Van der Merwe then went over from close range for a 15-point lead with 30 minutes left as the Scots were in the driving seat.
But changes in the forward pack gave Argentina fresh impetus and a spark of much needed energy at a crucial juncture as Scotland's challenge faded.
Substitute prop Chapparo immediately scored after coming on. The late strikes from Bertranou and Boffelli saw Argentina squeeze out a dramatic victory, sparking ecstatic celebrations at the stadium.
