| Argentina (2) |
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| Cerundolo, Francisco | | Etcheverry, Tomas Martin |
| | Australia (1) |
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| De Minaur, Alex |
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| Neumayer, Lukas | | Rodionov, Jurij |
| | Bulgaria (1) |
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| Dimitrov, Grigor |
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| Machac, Tomas | | Mensik, Jakub |
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| Assche, Luca Van | | Mannarino, Adrian |
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| Basilashvili, Nikoloz |
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| Zverev, Alexander |
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| Italia (5) |
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| Arnaldi, Matteo | | Berrettini, Matteo | | Cobolli, Flavio | | Darderi, Luciano | | Musetti, Lorenzo |
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| Griekspoor, Tallon |
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| Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
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| Nakashima, Brandon | | Paul, Tommy | | Tiafoe, Frances | | Tien, Learner |
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