As tennis authorities put their own anti-corruption programme under scrutiny, new evidence is emerging about the extent of the problem.
A documentary has revealed figures about "suspicious" players and just how much money is being gambled.
According to the ABC's Four Corners investigation, there are more than 350 professional tennis players who have been blacklisted by bookmakers.
There are more than 40 suspect matches identified by boomakers from a three month window last year - that's three a week and the numbers being bandied around are staggering.
Corruption in sport is one of the fastest growing organised crime types of the world at the moment. At the centre of much of it are the Philippines.
It's estimated globally the unregulated betting markets are worth between up to $3Tn dollars annually.
The documentary said it wasn't just high profile tournaments that were involved and that even low tier football matches in Victoria had been fixed.
Since a Tennis Integrity Unit was established in 2008, it has made findings against just 15 players.
This latest information would indicate the problem is a lot more widespread than that.
Newshub.
