British player Oli Golding says the International Tennis Federation faces a battle to end match-fixing.
Golding, 24, is currently ranked 716th in the world and says the issue for tennis authorities is the betting on low-ranking matches which are poorly attended but on which bookmakers still accept bets.
He was offered the opportunity to throw a match by Alexandros Jakupovic, a Greek player who was banned for life in 2015.
Golding reported the approach to the Tennis Integrity Unit [TIU] but says his anonymity was blown and he questioned whether or not he should have taken part in the lengthy process which resulted in Jakupovic's ban.
Golding told ITV News: "There is a problem in tennis and it does need to be stamped out, so I'm sure I did do the right thing, but it is a tough process to go through.
"I've never been questioned by lawyers in my life; I almost felt a little bit guilty for reporting him.
"The real problem the ITF face is that a lot of these matches are played in front of one man and his dog. You've got the umpire there who is maybe umpiring five or six matches in a day and is probably not paying that close attention to the match and, with the prize money at the level that it is, the reward is always going to outweigh the risk."
The Sport Betting Integrity Unit is wary of the rise of "in-play" tennis betting and suspicions which have arisen from the activity in the market.
An independent review panel has been tasked with assessing the systems in place that protect tennis's integrity.