Serena Williams: 'I'm in awe' of Venus

A pumped Serena Williams was always on top in the WTA Championships final against Maria Sharapova.
A pumped Serena Williams was always on top in the WTA Championships final against Maria Sharapova.

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    Serena Williams: 'I'm in awe' of Venus

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CNN's Pedro Pinto sits down with tennis star Serena Williams to talk about her sister and her game.