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Well, that something that actually can't be done by some team, especially Indonesia which as whole relies on young players and often has unstable emotions, Japan has senior players who are really experienced and that can have good impact on young players because their mentality and self-confidence are more maintained.
It the same with Saudi Arabia, but I don't consider it good achievement considering that in the group phase, big team often lose and look difficult, but after reaching the round of 16 to the quarter-finals, they will show their true strength.
Indonesia has just started, they are cutting a generation, renewing their squad depth with young players. This is a long-term project for Indonesia, they hope that the players they are currently training can play longer in the national team, so that chemistry between players can really be created.
Regarding Japan, they only need one win to qualify for the World Cup, because the points they have obtained so far are quite a lot and no national team in the group has been able to shift Japan's position as the leader of the standings, but even so, that will not make Japan choose to relax in the remaining matches, they will continue to show good performance to maintain the consistency of their national team, they will try to sweep the remaining matches.
And regarding the Saudi Arabian national team, Saudi Arabia has a league that is divided in Asia, but what Saudi Arabia showed in the World Cup qualifiers, it does not reflect at all that they are also the best team in Asia. Because, despite having the best league in Asia, but the players who are included in the Saudi Arabian national team squad, in their clubs, most of the players are just bench warmers, they have few playing minutes so that the performance of the players decreases. And this is what makes the team experience a significant decline, different from what they showed in the last World Cup.