Maria Sharapova Opens Up About Serena Williams Rivalry in New Book

The head-to-head rivalry between Maria Sharapova and Serena Williams is fairly one-sided — Williams has won 19-of-21 overall matchups. But an autobiography by Sharapova released today might add some steam to a rivalry that's almost always been in Williams' favor. The book, This article originally appeared on www.rollingstone.com: Maria Sharapova Opens Up About Serena Williams Rivalry in New Book

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