Argentina scored twice in the last 13 minutes to beat Brazil 2-1 on Wednesday and plunge Brazil back into trouble in the World Cup qualifying competition.
Brazil, the only team to have played at every World Cup, stunned the 60,000 crowd by taking a third minute lead with a bizarre wind-assisted own goal by Roberto Fabian Ayala.
The four-times world champions held out until the 77th minute when Marcelo Gallardo headed in from a chance created by substitue Ariel Ortega.
Then Brazilian defender Cris - under pressure from Ortega - turned a cross from Claudio Lopez into his own net from close range to hand Argentina the winning goal with five minutes remaining.
Brazil, who have 24 points, stay fourth in the South American qualifying group but are only ahead of Uruguay on goal difference.
The top four teams qualify, and the fifth plays off against Oceania winners Australia.
Argentina, who lead the group with 38 points, have already qualified.