"Rigged" can mean lots of things, including something being illegally stolen. Such as a rigged boxing match.
Perhaps this is just my ignorance of boxing but I dare say that example didn't enlighten me. I can't think of any case in sports (or elsewhere) where I've seen "rigged" to mean illegal conduct. I thought that's generally called something else, like a foul.
That doesn't make sense... the fight is rigged (and you're claiming this would be illegal in the fight) because people happened to gamble on it? I've never seen a sport where the legality of a move depends on whether some outsider had gambled on it.
Wouldn't it be the gambling that would be rigged at that point, instead of the fight?
Wrestling is a different beast but boxing is heavily regulated in the US