What's wrong with Argentina?
In the course of one round, the pressure in South America's World Cup qualification campaign has changed hands.
It was on Brazil, but their 3-0 win away to Chile takes them to second in the table, above Argentina on goal difference - an Argentina who have now gone four rounds without a win.
And in this midweek's eighth round, Brazil have much the easier game, the home banker against Bolivia.
Argentina, meanwhile, travel to Peru, who for all their problems have yet to lose in Lima in this campaign, and who will have their tails up after registering their first win on Saturday.
So what's the problem with Argentina?
There is no side in the world more pleasing on the eye, with their intricate midfield patterns. But for all their success at Olympic and Under-20 levels, their last senior title came in 1993. How can a side that circulate the ball so well be looking on Wednesday for their first win in five games?
What's more, they seem to be aware that something is wrong.
For the first 10 minutes at home to Paraguay on Saturday they were irresistible. The opening goal seemed a matter of time. But as soon as they went behind to Gabriel Heinze's own goal, the confidence drained out of them and for a while they were a shambles. The team sensed its own fragility. Perhaps they know that for all the interpassing they need to improve in both penalty areas, where matches are won and lost.
Gabriel Heinze is an example, a good, gutsy club defender who is not up to international football. At the highest level he is exposed as being neither one thing nor the other. He's not quick enough to play full-back - the Brazil coaching staff made it very clear that playing on this won them last year's Copa America - and not commanding enough for a centre back - Saturday's own goal was another illustration.
Now that Roberto Ayala has gone the Argentina back line is creaking. There is not a lot of pace there. Also, if they are going to select three centre backs, as they did on Saturday, then two of them must be capable of bringing the ball out of defence. If not, the consequence is a sequence of passes played back to the keeper - and Carrizo, the substitute goalkeeper who came on after first choice Abbondanzieri was injured, is not at his most comfortable with the ball at his feet.
He did, though, produce one flying save to ensure that Argentina secured a 1-1 draw. All eyes will be on Carrizo on Wednesday. It is a long, long time since Argentina produced a top class keeper - an aspect of the game where they have been comprehensively overtaken by Brazil. One of Brazil's leading goalkeeping preparation specialists told me he thought Argentine keepers were strong on personality but weak on technique.
In Argentina they are confident that the new generation has been better trained. Ustari, who injured himself in the Olympics, had a troubled season with Getafe in Spain but remains a hope. Romero, who took over from him, may be one for the future. But this is Carrizo's moment to show that he can provide the solution.
At the other end of the field, Carlos Tevez has become a problem. On Saturday he was sent off in the first half - as happened in the last World Cup qualifier he played, away to Colombia. But when he manages to stay on the pitch his scoring record is hardly prolific - seven goals in 42 games.
Sergio Aguero, who came off the bench to score Saturday's equaliser, looks a better bet. His extra pace means that he can be slipped behind the line.
But Argentina have plenty of stocky little strikers. What is lacking, if only as an option on the bench, is a target man. The key to Brazil's 3-0 win in Chile was the physical power, aerial strength and cutting edge of centre forward Luis Fabiano. Since the decline of Hernan Crespo Argentina have missed this type of player.
In the first 10 minutes against Paraguay the Olympic hero Di Maria, making his senior debut, put over two gorgeous crosses from the left. No one got on the end of them - if Batistuta was still around his eyes would have lit up.