Andre Agassi Andre Agassi

Tennis ace Andre Agassi regularly used crystal meth in the late '90s, he reveals in his new book, according to People.

"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," Agassi, 39, told the magazine.

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Agassi's memoir, Open, hits shelves Nov. 9 and covers everything from his failed marriage to Brooke Shields to his drug past.

"I was worried for a moment, but not for long," Agassi tells People about revealing his drug use. "I wore my heart on my sleeve and my emotions were always written on my face. I was actually excited about telling the world the whole story."