According to a report in the L.A. Times, citing a report in French sports source L'Equipe:

. . . two so-called elite players, Mister A and Mister B, [are] saying they have actually witnessed "thrown" matches, including one on the level of the Tennis Masters Series. Each said he was offered a bribe to throw a match and one said the sport must act "before things get out of hand." One also said that players' lounges are full of people on laptops, and that "60-80 percent of the coaches are on Internet betting sites."

There was irregular betting activity involving a match between Nikolay Davydenko and Martin Vassallo Arguello at the beginning of August and Doubles player Bob Bryan admits that players have been asked to fix matches.