Just reading about match fixing allegations at Wimbledon. I'm usually not giving benefit of doubt but this time, wondering if too much has been made, given the sources seem to be pretty similar most of the time (German, French). Depending on the source, he's "found guilty".
I believe that match fixing happen all the time, there are multiple things someone can fix and not just winning or losing the match, and those allegations and people getting exposed is just who were bad enough to get caught, I think there are too many that successfully fixed with no proof behind.
This is true not only for tennis but also for all other professional sports on which many people bet.
When big money is at stake, of course there are plenty of opportunities for collusion and fraud.
Tennis is a sport in which realistically only the first 40-50 players on the ranking list can live richly, the next 100-200 players survives and the rest not even that.
Tennis is also a very expensive sport, and of course many lower-ranked tennis players without sponsors cannot afford expensive trips and participation in better-paid tournaments.
If you can't make big money in lower paying tournaments and the costs are high, what's left for you? For some tennis players, the answer is obvious, to try to make money in other, illegal ways and at least somehow monetize their tennis career.