I saw this reddit post:
Yeah that's what I wound up doing. Finished the game today actually. But it turns out that I lost a round to Apollo in the first fight only so... RIP.
...
And I managed to not let Apollo win any rounds of the ''first'' of his '5 out of 9 rounds' duels.
Now I'm on the second duel. Do I need to do perfectly this time to get something special? Or is it just winning against him in the duels at all, that I need to care about?
Something being a Trophy / Achievement / Dialogue, etc. Anything in-game that changes with a 5-1 Lea Victory vs. a 5-0 Lea Victory in the second duel.