That is common because they don't have any strings to pull or that their promoter has no ties with the governing bodies or committees that will get the outcome to their favor, in those cases, they already know what would be the outcome and that the result will not be in their favor. To sum it up, almost all sports industries have the same problems because this is a multi-millions sports after all, we just got to be accustomed by it.
In some cases, they can not do something about it but there are promoters for that event that will surely use someone to make the fight in their favor and that task was always on the referee's decision-making, well there is recent news that a referee has recently admitted to cheating the knockout count for Pacquaio and prolonging the count because he is a Filipino well there are surely different aspect for the said cheating and allowing Manny Pacquiao to rest a bit and that Referee was Carlos Padilla so in this recent statement referee is surely prone to commit cheating for their favorite boxer, but if the fight is dominant enough are there are no chance for the following to make that cheat then there is no need to worry about something, but then if the fight was close then it can easily manipulated by the referee of the judges,
It's truly embarrassing to know that these kind of stunts are getting common these days, I mean I know that promoters are starting to become more greedy to get their cows some favor but buying a referee and a judge to make the situation certain is quite too far already. Yet the governing bodies and committees are turning to a blind eye because even them have also participated these stunts as they are also getting some benefits about these things.
the most non-obvious manner or else they would be fucked up by lots of criticisms or the worst they might be facing up some legal actions or some sort.