Pumas captain Juan Martin Fernández Lobbe was left a disappointed man after their 54-17 defeat to Australia.
The Pumas were expected to seriously challenge the out-of-form Wallabies and possibly pick up their first ever win in the Rugby Championship.
However, they were outclassed in Rosario on Saturday as Australia scored seven tries that were spearheaded by three from full-back Israel Folau.
"They played a great match, great rugby, they were able to display the game they hadn't managed in the previous games in the tournament," he said.
"They pounced on our loss of possession and failures in defence and then it becomes difficult to chase the score the whole match.
"We are disappointed but we have to congratulate Australia for the way they played. They came here with their backs against the wall and played great rugby. We missed too many tackles."
And centre Felipe Contepomi, who was playing his final international match of a career that yielded 87 caps and 651 points, said: "I'm fortunate for all I've experienced in rugby.
"We failed again, making individual errors. You're playing against the three best teams in the world. Just when you think you're getting close they pull away. We have to keep working."