Btw I have a small doubt:
-Duels will be finished when one of dueller won 9 duels.
Does it mean, you "win" your duel against X person, when you accumulated 9 won duels against him?
Or does that mean that, as soon as someone got 9 victories overall, he is declared winner of the whole tourney?
Whatever is your answer, could you please detail what kind of tournament rules are you going to use to determine the victor?