SCHLIRi,
ok, I checked your saved game, and actually I didn't notice Juan Herrara was number 1. So yes, his skills are totally normal, because he has low Concentration & Consistency so his other skills are pretty high.
For Karagoz, did you lost in R3 of Toronto in 2022 ? If yes, I guess your player had a bad day. If not, then it could be because you played him on a slow surface where he was well trained while your player wasn't.
Algo,
I fixed the disappearing players in the last update.
I had forgotten to tell you : to configure your players and your controls, copy over from your TE2013's Tennis.ini to TEM2's Tennis.ini these 4 sections : [TrainingClub_p1], [TrainingClub_p2], [Controller], [Keys1] (if you play with keyboard) or [Joy1] (if you play with a controller).