Argentina and South Africa drew 16-16 in the Rugby Championship, a moral victory for the Pumas who had led 13-3 at halftime.
It was Argentina's first draw against the Springboks after 14 losses.
Martin Rodriguez scored three penalties and a conversion for the home side, and Santiago Fernandez scored a try for the Pumas in the first half.
South Africa got three penalties and a conversion from Morne Steyn, and Frans Steyn added a try late. Morne Steyn missed a penalty in the 74th minute that would have given the Springboks the edge.
South Africa defeated Argentina 27-6 last weekend in Cape Town in Argentina's first match in the championship.
But the Springboks were lucky to get away with the draw a week later.
Argentina missed a drop goal in the 64th that would have made it difficult for South Africa to come back.
Two minutes later, Frans Steyn blocked a kick, and recovered the loose ball and ran it down for a try with Morne Steyn adding the conversion. The try came as South Africa was struggling to mount any pressure or even maintain possession.
"They were committed but we can only blame ourselves for this result," South Africa captain Jean de Villier said. "We had opportunities but didn't capitalize. We need to take a hard look at ourselves."
The mood at Estadio Malvinas Argentinas was more positive.
"It was an improvement (from Cape Town), but we are disappointed," Argentina captain Juan Martin Fernandez Lobbe said. "We made a step forward so we are happy.
"We wanted to win. We are disappointed right now but we are going to remember this day for the rest of our lives, our first game at home in the Rugby Championship."
Argentina 16 (Santiago Fernandez try; Martin Rodriguez conversion, 3 penalties) drew with South Africa 16 (Frans Steyn try; Morne Steyn conversion, 3 penalties). HT: 13-3.
AP