| Argentina (2) |
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| Andreozzi, Guido | | Schwartzman, Diego |
| | Australia (6) |
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| De Minaur, Alex | | Duckworth, James | | Ebden, Matthew | | Millman, John | | Popyrin, Alexei | | Thompson, Jordan |
| | | Francia (4) |
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| Chardy, Jeremy | | Mannarino, Adrian | | Pouille, Lucas | | Simon, Gilles |
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| Grecia (1) |
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| Tsitsipas, Stefano |
| | Hungría (1) |
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| Fucsovics, Marton |
| | | Japón (2) |
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| Daniel, Taro | | Nishioka, Yoshihito |
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| Rusia (2) |
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| Medvedev, Daniil | | Rublev, Andrey |
| | | Eslovaquia (1) |
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| Klizan, Martin |
| | España (2) |
|---|
| Garcia-Lopez, Guillermo | | Ramos-Vinolas, Albert |
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| | Estados Unidos (5) |
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| Harrison, Ryan | | Kudla, Denis | | Opelka, Reilly | | Querrey, Sam | | Tiafoe, Frances |
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