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Two tennis officials have been banned for corruption offences and four more are currently suspended, the International Tennis Federation has announced.
Kirill Parfenov of Kazakhstan was banned for life in February 2015, after making contact with another official on social media in a bid to manipulate match scoring.
Denis Pitner of Croatia was suspended for a year last August after passing on fitness details of a player to a coach and accessing a betting account from which tennis bets were placed.
The story, which was revealed by the Guardian, follows BBC and BuzzFeed allegations about match-fixing at the top level of the sport that overshadowed the start of the Australian Open last month.
Those reports led to the announcement of an independent review into tennis' anti-corruption practices, which are overseen by the Tennis Integrity Unit (TIU).
The newly-reported offences are said to have taken place on the Futures Tour, the lowest rung of professional tennis.
In a joint statement on Tuesday, the TIU and ITF said: "Kirill Parfenov of Kazakhstan was decertified for life in February 2015 for contacting another official on Facebook in an attempt to manipulate the scoring of matches.
"Separately, Denis Pitner of Croatia had his certification suspended on 1 August 2015 for 12 months for sending information on the physical well-being of a player to a coach during a tournament and regularly logging on to a betting account from which bets were placed on tennis matches."
The statement added: "To ensure accuracy of reporting, four officials are currently suspended pending the completion of ongoing investigations by the TIU. In order to ensure no prejudice of any future hearing we cannot publicly disclose the nature or detail of those investigations. Should any official be found guilty of an offence, it will be announced publicly."
The most damning aspect of the recent match-fixing allegations was that authorities had not investigated properly - a charge strenuously denied by the TIU.
However t he sanctions against the two officials were not made public prior to the Guardian's investigation.
In their statement, the TIU and ITF explained that was because the officials had been sanctioned under the ITF code of conduct for officials, which did not allow for the information to be made public.
The code was amended in December 2015 and sanctions issued from now on will be announced. They could include the four officials who are currently suspended.
The statement said: "In order to ensure no prejudice of any future hearing we cannot publicly disclose the nature or detail of those investigations. Should any official be found guilty of an offence, it will be announced publicly.
"The decision to sanction both officials under the ITF code of conduct was taken following TIU investigations. This approach is being reviewed as part of the recently announced independent review of integrity in tennis that will be chaired by Adam Lewis QC."
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