In his upcoming autobiography, Agassi admits he used crystal meth in 1997 and failed a drug test _ a result he says was thrown out after he lied by saying he ‘unwittingly’ took the substance. ‘If you're going to tell your story, you owe it to yourself to tell it honestly,’ Agassi told the magazine in its latest issue. ‘Especially if you're going to call it 'Open.’' New excerpts published on Friday reveal Agassi wore a hairpiece that nearly fell off at the 1990 French Open, became jealous during ex-wife Brooke Shields' appearance on ‘Friends,’ and how Shields put a photo of Steffi Graf _ now married to Agassi _ on the fridge for motivation to get in better shape before their wedding. ‘It's a photo of the perfect woman, she says,’ Agassi...