A South American tennis player claims match-fixing is "a secret on the tour everybody knows".
The player, who requested anonymity, told the BBC that match-fixing is commonplace, adding that even some top players are "a little bit dirty in some way".
"This is like a secret on the tour that everybody knows, but we don't talk about it," he said. "We just see it and keep working."
He claimed there are three "big" groups controlling betting in tennis, with payments made to players in cash.
"Each group has many guys who go to talk to players," he said.
"They have many guys inside the circuit. Also, they have many accounts. They have 50-60 accounts where they place small money. At the end, it's huge money. It's really big.
"You know who is doing it, and who is not. As a player I know who is missing on purpose or returning a shot in the middle on purpose; who is trying, and who is not. So we work on this - we know."
He added that players would exchange smiles and remarks that indicate they are fixing during a match.
The Tennis Integrity Unit (TIU) dismissed "any suggestion that evidence of match-fixing has been suppressed".
"We invite the player behind the allegations to make contact with the TIU and to share the information he claims to have," the TIU said in a statement.
The allegations stem from a BBC and BuzzFeed News investigation revealed suspected illegal betting in tennis.
3 News
