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US Open Tennis on Twitter: "Roger Federer knows how to put his comeback into perspective. https://t.co/acWCwb4bjM" / Twitter
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Financial Times on Twitter: "Roger Federer, winner of 20 Grand Slam titles, has announced his retirement from tennis at the age of 41 after a string of injuries https://t.co/OxofiBPic6 https://t.co/0rYPdG3pyl" / Twitter
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