Andre Agassi’s upcoming autobiography contains an admission that he used crystal meth in 1997, the year he dropped to No. 141 in the rankings.

In a story posted on People magazine’s Web site Tuesday, Agassi says: “I can’t speak to addiction, but a lot of people would say that if you’re using anything as an escape, you have a problem.”

Excerpts from the book are being printed this week by People and Sports Illustrated. A writer from SI first revealed the crystal meth reference on a Twitter posting Tuesday.