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Roger Federer position as greatest ever put in doubt by tennis legend: "No-one's the best of all time, ever" - Tennishead
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2019 US Open Notebook: Federer falls, Serena cruises on Day 9 - Official Site of the 2023 US Open Tennis Championships - A USTA Event
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U.S. Open 2019: Roger Federer's hopes ended as Grigor Dimitrov fights back to win instant classic | Sporting News
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Roger Federer recovers against Sumit Nagal, rolls into Round 2 - Official Site of the 2023 US Open Tennis Championships - A USTA Event
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