LONDON(AP) The president of the World Anti-Doping Agency wants tennis authorities to ``shed light'' on Andre Agassi's admission that he used a banned drug and escaped a suspension by blaming his positive test on a spiked drink.

On Wednesday, WADA president John Fahey says he is disappointed by the revelations in Agassi's upcoming autobiography. He says Agassi is a role model who should alert youth to the dangers of doping.

Agassi admits in the book that he used crystal meth in 1997. He says he lied to ATP Tour officials to explain his positive test, claiming he accidentally drank from a soda spiked with meth.

Agassi writes that the ATP accepted his explanation and dropped the case.

Fahey says WADA expects the ATP ``to shed light on this allegation.''