Six star teams are strong. They are usually grouped with teams similar in quality but 3 or even 4 levels higher. Six star teams are hard to improve because players train slowly, and even scout players cannot improve team qualities. In contrast, those high level teams grouped in same cups can can easily add five star players through auction or negotiation to replace their 2 or 3 star players Their new "five star players" can be nine star players in the eyes of low level teams.

The managers of low level six star teams are smart, so their teams are possible to reach cup final. But the opponents are highly possibly 9 star teams in their eyes.

I think many above suggestions to handle 9 star teams are good. My recommendations in simple terms are defending, being very firm and patient, lowering scores in this match, and aiming at winning in last minutes or through penalties.