Roger Federer says Serena Williams is the greatest tennis player of all-time

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• Roger Federer said he thinks Serena Williams is the greatest tennis player of all time.
• Federer said that Williams' single and doubles accomplishments are unparalleled in the game.
• Williams said the same could be said for Federer.

Serena Williams is preparing to play in the French Open, her first major since having her first child.

To Roger Federer, Williams' legacy is already cemented, even if she doesn't add to her decorated career.See the rest of the story at Business Insider

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