![Deadspin on Twitter: "Roger Federer says Serena Williams is the greatest tennis player of all time, period: https://t.co/OiLI6AQUvO https://t.co/FMlW8B58hx" / Twitter Deadspin on Twitter: "Roger Federer says Serena Williams is the greatest tennis player of all time, period: https://t.co/OiLI6AQUvO https://t.co/FMlW8B58hx" / Twitter](https://pbs.twimg.com/media/Dd5CMJ8U8AAhZEm.jpg)
Deadspin on Twitter: "Roger Federer says Serena Williams is the greatest tennis player of all time, period: https://t.co/OiLI6AQUvO https://t.co/FMlW8B58hx" / Twitter
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Serena Williams And The Difference Between All-Time Great And Greatest Of All Time | FiveThirtyEight
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