Serena Williams’ legacy as she prepares for US Open match

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Serena Williams’ childhood tennis coach Rick Macey discusses her journey to becoming a 23-time Grand Slam Singles Champion and his advice to her in Wednesday's match. WATCH the ABC News Live Stream Here: https://www.youtube.com/watch?v=w_Ma8oQLmSM SUBSCRIBE to ABC NEWS: https://bit.ly/2vZb6yP Watch More on http://abcnews.go.com/ LIKE ABC News on FACEBOOK https://www.facebook.com/abcnews FOLLOW ABC News on TWITTER: https://twitter.com/abc #abcnews #abcnlupdate #serenawilliams #tennis #usopen

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