BBC Radio 4 report Simon Cox: "When Davydenko retired hurt, forfeiting the match, Betfair took the unprecedented step of voiding the match and returning all the bets. This created a huge stir within the betting industry. 

"On the banks of the Thames within the offices of Betfair the company decided to take further action."

Betfair's Mark Davies on File on 4: "The money was coming from a very small number of accounts that were based in Russia and we couldn't be certain as to why they were as confident as they were about an outcome that didn't seem terribly likely."

Image source, Getty Images

The story begins in August 2007 in Sopot, a pretty coastal town in Poland with an annual tennis tournament that was so low key there is no video archive or even images of it. Nothing. 

In the second round the Russian world number four Nikolay Davydenko was taking on the Argentine Martin Vassallo Arguello, ranked way below him. 

Normally such a match would attract modest gambling but at the betting exchange, Betfair, alarm bells rang when they saw over £3m placed on the match.

BBC Radio 4 reporter Simon Cox:"It’s not often you say this - but this is a story that has taken me six years to tell - it starts in 2009 when I was meeting a source at this office in central London and found out about an investigation that tennis had ordered into suspicious betting – I was told about confidential reports linking top players to match fixing and that set me going. 

"I spent years chasing this - in between other stories speaking to all of the key players but they weren’t willing to go public.…then when I had almost given up hope - working with Buzzfeed a whistleblower passed us a cache of secret documents which for first time tell the inside story of how tennis kept secret the extent of players suspected to be match fixing and that the problem continues to this day."

File on 4 is under way now on BBC Radio 4 and will reveals the full inside story linking top players to suspected match fixers.

There will be an an exclusive interview with a former top police officer called in to investigate the sport, and with global attention on tennis the programme will ask has it done enough to keep the game clean?

Listen on BBC Radio 4 and online on this page.

The cache of documents passed to the BBC and Buzzfeed News include the findings of an investigation set up in 2007 by the Association of Tennis Professionals, the organisation Kermode heads. 

Its job was to look into suspicious betting activity after a game involving Nikolay Davydenko and Martin Vassallo Arguello.

Both players were cleared of violating any rules, but the investigation developed into a much wider enquiry looking into a web of gamblers linked to top-level players.

The documents obtained show the enquiry found betting syndicates in Russia, northern Italy and Sicily making hundreds of thousands of pounds betting on matches investigators thought to be fixed. Three of these matches were at Wimbledon.  

Chris Kermode, who heads the Association of Tennis Professionals, rejected claims evidence of match-fixing had "been suppressed for any reason or isn't being thoroughly investigated".

But he added: "While the BBC and BuzzFeed reports mainly refer to events from about 10 years ago, we will investigate any new information."

"Over the last decade, 16 players who have ranked in the top 50 have been repeatedly flagged to the Tennis Integrity Unit (TIU) over suspicions they have thrown matches.

All of the players, including winners of Grand Slam titles, were allowed to continue competing.

Read more here.

Image source, .

In half-an-hour, File on 4 on BBC Radio 4 reveals secret evidence of match fixing in tennis and investigates claims that sport's governing bodies have failed to act on repeated warnings about suspect players. 

The programme has seen confidential documents which reveal how some were linked to gambling syndicates in Russia and Italy which won hundreds of thousands of pounds betting on matches they played in. 

A number of those who have been repeatedly flagged on fixing lists passed to the game's Tennis Integrity Unit have continued to attract highly suspicious gambling activity. 

Reporter Simon Cox also has an exclusive interview with one of the most high profile players to be banned for match fixing who says the problem is widespread in the sport. 

It promises to be very interesting, and you can listen to full 40 minute programme on this page.

Image source, Getty Images

Now then fellas, here's a story to make you wince..

Glasgow's Scotland flanker Ryan Wilson has been cited for allegedly grabbing the testicles of Northampton's scrum-half Lee Dickson.

If found guilty of the incident, which occurred in the 25th minute of Sunday's European Champions Cup game, Wilson, 26, could face a minimum 12-week ban.

Wilson's disciplinary hearing will take place on Wednesday, with any ban likely to rule him out of the Six Nations.

The Tour of Britain and its sister race, the Women's Tour, needs a new sponsor after Aviva ended its backing.

The insurance firm's association with the two biggest cycling races in Britain will end after the third Aviva Women's Tour, which takes place from June 15 to 18, leaving September's men's Tour of Britain without a title sponsor.

Bolton Wanderers captain Darren Pratley says avoiding relegation from the Championship this season would be as good "as good as getting promoted".

The Trotters, who face non-league Eastleigh in an FA Cup replay on Tuesday evening, are bottom of the Championship table.

"If we get out of it in my eyes, it could be a miracle," 30-year-old Pratley told BBC Radio Manchester.

Whitehawk have begun talks with the Football Association about changing the club's name to Brighton City but some of the National League South club's fans oppose the change and have launched an online petition in an attempt to block it.

In December, chairman John Summers told BBC Sussex: "We believe it would widen the profile of the club."

A statement on the website carrying the petition , external criticised the club for offering no more than "a single sentence" of explanation.

The statement continued: "While we understand that Whitehawk's owners want the best for the club, we do not feel that changing the club's name to 'Brighton City FC' is the right choice.

"Not only is the current name unique, but the team's amazing FA Cup run this year offered a great amount of exposure for Whitehawk."  

Image source, Getty Images

Image source, SWPix.com

Prop Ryan Bailey says he would not have signed for Warrington Wolves if he had not received help for depression.

The 31-year-old was treated at the Sporting Chance clinic, set up by former Arsenal footballer Tony Adams.

Bailey, who agreed a one-year deal with Warrington in November, told BBC Radio Merseyside: "I never asked for help in my life for anything because it's like weakness, especially in a manly sport like this."

Image source, Getty Images

Luton Town have appointed former player and manager Mick Harford as their new chief recruitment officer.

The 56-year-old guided the team to victory in the 2009 Johnstone's Paint Trophy final during his spell as boss.

Striker Francois Zoko is a Yeovil doubt against his former club after taking a blow to the nose in Saturday's 2-1 defeat by Morecambe.

On-loan Everton midfielder Liam Walsh is fit, as is Marc Laird who was on the bench after injury but did not figure.

Carlisle striker Jabo Ibehre played 89 minutes at Barnet despite muscle tightness and is likely to be considered for the trip to Somerset.

Captain Danny Grainger picked up cuts and bruises but should also be fit.

Watch tonight's FA Cup goals as they happen live on the BBC Red Button and the BBC Sport website.