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."