World number five Rafael Nadal has invited the International Tennis Federation to publish the results from all of his drugs tests.
The Spaniard is suing former French government minister Roselyne Bachelot, who accused him of doping.
In a letter to the ITF, he said people should not "speak without evidence".
The 29-year-old added: "Please make all my information public, my biological passport and my complete history of anti-doping tests."
On receipt of the letter, the ITF said the 14-time Grand Slam champion has never failed a drugs test and is free to make public his anti-doping records, to which he has full access.