UK Tennis body
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Following the broadcast of the File on 4 programme 'Tennis: Game, Set and Fix?' on BBC Radio Four during Tuesday evening, BBC Sport later published a fresh claim from an unnamed South American tennis player in an interview with the BBC's World Have Your Say team which detailed how matches are said to be rigged and how criminals try to avoid detection.
The male player, who requested anonymity, alleged the issues were 'like a secret on the tour that everybody knows, but we don't talk about it.. You know who is doing it, and who is not... We just see it and keep working'.
However, claims that the sports authorities 'don't want it to be stopped' were rejected by the TIU, which was set up in 2008.
'The TIU and the tennis authorities absolutely reject any suggestion that evidence of match fixing has been suppressed for any reason. The sport has a zero-tolerance approach which is enforced with the full powers of the Tennis Anti-Corruption Program, which includes lifetime bans and punitive financial penalties, ' the organisation said in a statement.
'Since 2009 all professional players, support staff and officials have been subject to this stringent code, which makes it compulsory to report any corrupt approaches or knowledge of suspected corrupt practices to the TIU. Failure to do so is a breach of the Program which can be subject to disciplinary action.
'The TIU works closely with players to prevent corruption through education programmes and confidential reporting systems. The great majority of the 21, 000 active professional players are good people of high integrity who abhor the suggestion that the sport they love is tainted with allegations of corruption.
'We invite the player behind the allegations to make contact with the TIU and to share the information he claims to have.'
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TENNIS MATCH-FIXING ALLEGATIONS: THE KEY NUMBERS
16 - core group of players who are claimed to have repeatedly been reported for losing games when highly suspicious bets have been placed against them.