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Roger Federer sends out ominous US Open warning but Serena Williams slumps to defeat in Cincinnati | The Sun
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Roger Federer sends Rafael Nadal and Novak Djokovic retirement warning amid speculation | Tennis | Sport | Express.co.uk
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Roger Federer fires umpire warning ahead of US Open clash with Nick Kyrgios: "You don't go and speak like that" - Mirror Online
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Roger Federer issues warning to rivals at Australian Open, saying: 'I have plenty left in the tank' - Tennis365
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