Tennis great Andre Agassi says in his new autobiography that he used the drug crystal meth in 1997, then lied about the nature of his problem when he failed a drug test.

Agassi says in the book, called Open, that after he failed the drug test, he wrote a letter telling authorities that his drink was spiked with crystal meth by an assistant named “Slim.” The ATP tour threw out the case at the time.

"Then I come to the central lie of the letter," Agassi writes in the autobiography, according to an excerpt published by the Associated Press.  "I say that recently I drank accidentally from one of Slim's spiked sodas, unwittingly ingesting his drugs. I ask for understanding and leniency and hastily sign it: Sincerely.

"I feel ashamed, of course. I promise myself that this lie is the end of it,” he writes.