Separately, in 2007 several players reported being approached by illegal gambling rings offering money to fix matches. The ATP's subsequent investigation found some players had gambled in contravention of the ATP's rules. Although none had bet on their own matches, five players were fined and suspended. The much-publicised Davydenko-Argüello match in Sopot, where Betfair suspended betting after a series of highly unusual bets, prompted a rethink in the sport. De Villiers initiated an independent review to investigate whether corruption was systemic within the game. The report called for the establishment of a tennis-wide anti corruption unit, a recommendation that led to the Tennis Integrity Unit, a joint initiative by the ATP, ITF, WTA and the Grand Slam committee. In a 2007 interview with the "New York Times", De Villiers said: “"We can’t possibly stop our athletes being approached illegal gambling rings. We can’t have all of our 700 or 800 athletes with bodyguards, but what we can do is educate them on their responsibilities when they are approached and the consequences of not behaving appropriately."”