The joint investigation by the BBC and BuzzFeed claims current and past top-50 players, including several at this month's Australian Open, are suspected match-fixers.
A crime in sport.
That's how World number one Novak Djokovic has described match-fixing.
The Australian Open favourite insists there is no real proof of the current claims, which allege match-fixing in the past among tennis' top players - some of whom are still competing.
But the 28-year-old Serb has revealed his team was approached in 2007, asking him to deliberately lose a first-round match at the St Petersburg Open in Russia.
"I was not approached directly. I was approached through people who were working with me at that time. They were in my team and of course we threw it away right away. It made me feel terrible because I don't want to be linked to this kind of - some people may call it an opportunity - for me it's an act of, in sportsmanship, a crime in sport."
A joint BBC-BuzzFeed investigation claims current and past top-50 players, including several at this month's Australian Open, are suspected match-fixers.
The report says a strong body of evidence is behind the referral of a core group of 16 men - including grand slam winners - to the Tennis Integrity Unit in 2008.
No players are named in the report and none have faced sanction.
Tennis authorities have rejected the allegations.
BuzzFeed journalist Heidi Blake has defended her report, saying tennis authorities have to be more transparent.
"Well we're hearing from multiple sources and the evidence we're seeing in our files really suggests that this is a problem across the breadth and depth of the game. It's widespread, it's happening at all levels, it is quite deep-rooted, and I think it's going to take a lot for tennis to really crack down on it effectively, and so yes I think there does need to be a full investigation. It needs to be transparent, the results should be published, and I guess tennis really needs to figure out a roadmap to really reform the game."
Seventeen-time grand slam winner Roger Federer regards match-fixing as serious.
But the Swiss superstar is unhappy with speculation regarding the issue in tennis.
"Who? What? It's like thrown around. It's so easy to do that. I would like to hear the name. I would love to hear names.Then at least it's concrete stuff and you can actually debate about it. Is it now? Was it before? Was it a doubles player, a singles player? Which slam? It's so all over the place. It's nonsense to answer something that is pure speculation."
Twenty-one-time grand slam champion Serena Williams has dismissed any hint of match-fixing in women's tennis.
While there's been no suggestion of any such behaviour on her tour, Williams makes it clear that kind of behaviour isn't in her nature.
"Not that I'm aware of. When I'm playing, and I can only answer for me, I play very hard and every player I play seems to play hard. As an athlete, I do everything I can to be not only great but historic. If that's going on, I don't know about it. I'm kind of sometimes in a little bit of a bubble."
World number five, Russian player Maria Sharapova, had a similar message.
"I guess I can only speak for myself, but we want to succeed at it by improving, by getting better, by beating our own best, and not by anything else. That's how I would hope everyone else would think, as well."
Mark Petchey, a former coach to British tennis star Andy Murray, says he believes the problem exists mainly at the lower levels of the sport.
Speaking to Sky News, Mr Petchey says players at the top of the game are not as vulnerable to temptation.
"I think at the top end of the game, right now certainly with those guys, with the money that they are making, it's not about the money for them, you know, it's not really a problem. But where it really does exist is at the lower levels and I think one of the problems you have there is, as we know, in life, if somebody bad gets their hooks into you very early on in a career you don't really ever get away from it. It is very difficult to actually prove this guilt. There can be a lot of smoke and you can even see a few embers there but actually getting these, you know, players and syndicates, you know, up in front of a judge and getting them found guilty is going to be incredibly difficult."
