I played a good amount of Mario Strikers Charged because I got it alongside an amiibo after trading in some games I didn't want anymore. That said I've probably already reached my upper limit of skill because the Crystal Cup is much harder than the Fire Cup was even on the first match, I'm not good at this deke maneuver you're supposed to be good at, and even if I manage to beat it then I'll have to face Diddy Kong in a one-chance opportunity to unlock him, or have to retry the Crystal Cup all over again, and he has the special ability of Red Card that allows him to kick one of your players out of the match.
While enjoyable, Mario sports games seem really unforgiving. Then again, maybe it's just this one that's difficult and I really just was not good at Golf.