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US Open 2021: Novak Djokovic defeats Holger Vitus Nodskov Rune – as it happened | US Open Tennis 2021 | The Guardian
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Three-time champion Novak Djokovic is defaulted in Round of 16 at 2020 US Open - Official Site of the 2022 US Open Tennis Championships - A USTA Event
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Novak Djokovic apologizes after defaulting US Open match for hitting line umpire with ball - ABC News
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Australian Open 2022: Novak Djokovic gets visa reinstated, but tournament status still unclear - CBSSports.com
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