It had appeared as if Brazil, after a 1-1 with Switzerland in its opening game, was heading for another stalemate.
Brazil finishes the group stage with Serbia, while Costa Rica waits on Switzerland.
A few days ago, FIFA's official Twitter announced that the first round match between five-time world Champions and Switzerland (1:1) was the most watched event in Brazil.
Neymar dropped to his knees after the final whistle, sobbing in his hands as his teammates surrounded him and then lifted him off the ground.
Coutinho got the victor in the 91st minute, and Neymar got his goal later in stoppage time as the South Americans move to four points in Group F and have a little breathing room with one match to play.
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"He's like a little brother to me; I try to look after him", Silva told O Globo.
"Tite always highlights that you have to be mentally strong from start to end, and today he mentioned that even if you score in the first or last minute you still have to fight for 90 minutes, and that is what happened".
The World Cup favourites were on course for a second consecutive draw in Group E before a dramatic period of stoppage time in St Petersburg. In the next match against Costa Rica, he complained to the referee frequently about not getting calls in his favour. But if Argentina claims all three points, it can still advance depending on the result of the other match between Croatia and Iceland.
Coach Tite's team were heading for a second inglorious draw when Barcelona midfielder Coutinho popped up to poke home from Roberto Firmino's nod down.
This led to Costa Rica being able to go on the counter-attack, but they too were unable to get past the Brazilian defence.
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A brace by Ahmed Musa earned Nigeria a 2-0 win over Iceland and ensured the battle for the second qualification spot from Group D will go to the final round of matches.
Although left back Marcelo had an average game in defense, his constant runs down the flanks ultimately helped when his unsafe cross led to the opening goal.
But with Brazil still five matches away from their sixth World Cup, concern is growing over Neymar's ability to handle the vagaries of fate still to be handed to him at Russian Federation 2018.
"We don't need referees decisions to win a game", Tite said.
Scoring against Argentina isn’t that hard , says Ahmed Musa
If Iceland win their match agianst Croatia , Argentina will go through only if they have a better goal difference than Iceland . In his word "I think I am a little better now".