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Stefanos Tsitsipas has astonishing on-court meltdown and injures his dad by smashing racquet after losing set at ATP Cup โ The US Sun | The US Sun
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Nick Kyrgios accused of getting coaching help from UMPIRE during US Open 2018 victory over Pierre-Hugues Herbert - Mirror Online
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You can't be the player's friend': inside the secret world of tennis umpires | Tennis | The Guardian
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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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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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