the athlete and the gamblers are always been the victim and the gambling owner and the government in which the corrupt one is always the winner,
they bag all the money and athlete and gamblers suffer.
also the corrupt officials of each sports that what makes this issue happening , hope that this will end so the gambling and the sports will back to their feet and support because nowadays people are losing interest .
You are mistaken here. It's some of the gamblers (big ones) who fix games and the gambling house itself. the house earns money based on the different bets placed on their platform and doesn't need to fix athletes to lose a game.
Basically, if the house has 1 million $ wagered on Djokovic and $1m wagered on Federer, they don't need to do anything but wait for the result because both sides will get around 1.85 odds or such and the house wins free 7-8 cents on each bet.
Nowadays people are even fixing the officials because bringing the players is risky and costly while the officials control the entire match and are mostly underpaid.
The house or the sportsbook only accept bets, they might get some information on fixed games but they cannot control the game. The ones that could potentially fix a game are those who are playing the game, the players, even the coach, and the referees, as their decision making could be vital to the outcome of the game.