Replacement winger Lucas Gonzalez Amorosino beat four defenders from 35 metres out to help Argentina to snatch a 13-12 victory over Scotland in Wellington that kept alive their rugby World Cup quarter-final chances.
Amorosino's 72nd-minute try, which was converted by captain Felipe Contepomi, brought Argentina back from 12-6 down to give the Pumas, who finished third at the 2007 World Cup, victory in a bruising encounter.
Meanwhile the Scotland coach Andy Robinson was left to rue one single play which cost his side victory in the Pool B game and left them likely to need a win against old foes England next weekend.
Both Argentina and Scotland have 10 points in Pool B, with leaders England on 14. The Scots play England on Saturday at Eden Park, while the Pumas play Georgia in Palmerston North next Sunday.
For Scotland to progress, they will almost certainly have to beat England and then hope that Argentina's result and the bonus-point situation works in their favour.