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By the Book: Understanding the rule behind Djokovic's default - Official Site of the 2021 US Open Tennis Championships - A USTA Event
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The rules are clear: Djokovic takes "big lesson" from US Open default | TENNIS.com - Live Scores, News, Player Rankings
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In the dirt like a dog': Medvedev asks official to default him while losing all-Russian tennis clash as Rublev laughs from stands — RT Sport News
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Djokovic default opens door for Thiem, Medvedev, Zverev at 2020 US Open - Official Site of the 2021 US Open Tennis Championships - A USTA Event
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Sensation as Novak Djokovic is defaulted at US Open after hitting lineswoman with ball - Tennis Majors
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Why was Novak Djokovic disqualified? US Open favourite axed for hitting ball at line judge - here's how the rules work
Novak Djokovic's US Open default a mess of his own making, but maybe this time he will learn - ABC News
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