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Venus and Serena Williams' dad 'put broken glass on tennis court while they trained' - Mirror Online
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I Believed in Venus and Serena' - Former Coach Rick Macci Explains What Serena Williams' Father Richard Williams Had Written in the Letter - EssentiallySports
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Former Coach Rick Macci Details Why Richard Williams Trained Venus and Serena Williams on Broken Glass - EssentiallySports
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