World number two Rafael Nadal said he had seen no evidence to back up Andy Murray's claims that corruption was rife in tennis.
"I think he's gone overboard, I don't think anything like that happens," Nadal was quoted as saying in the Spanish media on Thursday.
"I'm the number two in the world, I've been in all the meetings, I see what goes on on the circuit just like him and I'm not so stupid as to not know what is going on."
"I doubt very much that he (Murray) knows more than anyone else. I think that everyone gives it 100 percent and that there are no fixed games."
Murray said on Tuesday that players were aware matches on the ATP Tour were being thrown.
The ATP then said players would have 48 hours to tell the governing body if they were approached to throw a match or risk punishment if they failed to do so.
Both Nadal and Murray are due to take part in the Masters Series tournament in Madrid next week.
