Players cannot bet on their own games, but I'm sure their manager, coach, or someone else they know bets for that fighter because it's extra money if you win the fight, but I haven't seen or read anything about it because it's prohibited, so I'm sure they're doing it in secret. Also regarding having lost in their own game, it is sort of called "fixed games," about which we can see a lot of speculation but nothing that has proven it. This is really about money; they don't care about the game or the sports; they just want to win the teams they want because the money that was bet on it was very huge, so they will manipulate the game.
And the player can join those who bet for him to earn extra money from winning matches. This might be a great way to earn some extra money but they have to really keep it a secret from everyone else and after the win, they have to share the winnings in secret as well. This may have been common among players who use these methods to be able to bet on themselves but if this were to be found out, they would all be punished by the association so they could no longer play.Things like this are also often heard in certain games, for example in football there is the term fixing the score, this is the same type. Even though they don't gamble directly, they also enjoy the money they receive from people who want them to do so.
i've read from here about basketball game, so it was a local game and the audience spotted some unusual moves and it turned out the game was rigged. so yes, this kind of situation will ruin the career of the athletes involved, depending on the degree of their involvement. because if you are a loyal fan and you've been watching all the games of your favourite team, you will know something is wrong with the game. and this is the reason why you can't bet on your own game, as you will influence the result of the game one way or another.
