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US Open: Nick Kyrgios gets pep talk from umpire to set up Federer clash | US Open Tennis 2018 | The Guardian
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Tennis - ATP Finals - The O2, London, Britain - November 13, 2019 Umpire Mohamed Lahyani during the group
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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 fires umpire warning ahead of US Open clash with Nick Kyrgios: "You don't go and speak like that" - Mirror Online
This is what 'coaching' means in tennis - and why Serena Williams was penalised for it | Business Insider India
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