| Argentina (2) |
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| Cerundolo, Francisco | | Schwartzman, Diego |
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| De Minaur, Alex |
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| Dimitrov, Grigor |
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| Shapovalov, Denis |
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| | Finland (1) |
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| Ruusuvuori, Emil |
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| Berrettini, Matteo | | Musetti, Lorenzo | | Sonego, Lorenzo |
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| Bublik, Alexander |
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| Zandschulp, Botic van de |
| | | Serbia (1) |
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| Krajinovic, Filip |
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| Davidovich Fokina, Alejandro | | Martinez, Pedro | | Ramos-Vinolas, Albert |
| | | England (7) |
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| Broady, Liam | | Draper, Jack | | Evans, Daniel | | Jubb, Paul | | Murray, Andy | | Norrie, Cameron | | Peniston, Ryan |
| | Amerika (7) |
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| Brooksby, Jenson | | Fritz, Taylor | | Kudla, Denis | | Opelka, Reilly | | Paul, Tommy | | Querrey, Sam | | Tiafoe, Frances |
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