After Novak Djokovic revealed an approach to fix a match, Thanasi Kokkinakis also admitted he has received several such proposals from people on social media.

BBC and Buzzfeed broke a story on Monday, claiming several players, present and past, had come under suspicion of match-fixing, with the report also saying some of them were former Grand Slam winners. Reports in the Australian media have also said police are closely monitoring all first round matches at the Australian Open, which began on Monday in Melbourne.

The ATP denied the match-fixing claims, with the chief executive Chris Kermode insisting the problem exists at an "incredibly small level," while Tennis Australia refuted suggestions made by the reports as well. The chief executive and Australian Open tournament director Craig Tiley hit back at the reports for their "deliberate" timing.

"We have built an international reputation for the integrity of the tournament and the anti-corruption systems we have in place," Tiley said in a statement on Tuesday. "In conjunction with world tennis we have developed leading anti-doping, disciplinary, anti-corruption and security policies.

"All involved in the administration of the Australian Open will not tolerate any deviations from our values and rules at any level.

"Of course the deliberate timing of this story is far from ideal for our event. But the important issue here is that we stamp out any form of corruption in tennis. That's why, many years ago, Tennis Australia pushed hard for an all-sport response to this issue. Stamping out any form of corruption requires a continued focus on prevention, education and investigation."

Questions on the match-fixing issue was going to be a certainty in the post-match press conferences for the players, and Djokovic, in one of those pressers, admitted to being approached by an unknown person back in 2007.

Now, Kokkinakis, most famous for finding himself unwittingly involved in the Nick Kyrgios-Stanislas Wawrinka controversy, has come out and said he received several approaches to fix matches from unknown people on social media.

"Not face-to-face, but on social media you read some stuff on your Facebook page, just these randoms from nowhere saying 'I'll pay you this much to tank the game,'" ABC quoted Kokkinakis as saying to 3AW.

"It's interesting, you get a lot of stuff if you lose a match that maybe the betters or something think you should win. You just get abused on social media. It's a very common thing. For tennis players, and I'd assume other sports, it's a very common thing."

Former tennis player Arvind Parmar of Great Britain also revealed an approach to throw a match. "I was offered an envelope full of Euros to lose in two sets, only an hour before I was due on court," Parmar told The Times.

"I was approached by a random guy as I was coming off the practice courts. He showed me the money and said that I had to lose in two sets. He seemed anxious, nervous, and after a few quick words he began trying to press an envelope stuffed with Euros into my hand.

"It was a substantial amount of money -- tens of thousands -- way more than I would have earned from winning the tournament and more than most players at that level would make in a year."

Meanwhile, Milos Raonic has called for authorities to clamp down on such activities, while sticking to the belief that tennis remains, for the most part, a clean game.

"I don't think anybody in tennis believes and stands for it," Raonic told reporters. "If the story has any validity to it, I hope the people that may be weeded out. Tennis is a beautiful game. There are many great things about it.

"It's a little bit sad to read that and the attention ... is more on that than the Australian Open, which is one of the four biggest events we play.

"I believe there is a hotline that we have as an option really to confront if this does come up. I think that there is enough, at least from what I understand and from my personal experiences, being done regarding it."