| Argentina (1) |
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| Navone, Mariano |
| | Australia (2) |
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| De Minaur, Alex | | Popyrin, Alexei |
| | Austria (2) |
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| Schwaerzler, Joel | | Thiem, Dominic |
| | Brasile (1) |
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| Seyboth Wild, Thiago |
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| Bulgaria (1) |
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| Dimitrov, Grigor |
| | | Repubblica Ceca (2) |
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| Machac, Tomas | | Mensik, Jakub |
| | Francia (2) |
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| Halys, Quentin | | Monfils, Gael |
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| Germania (2) |
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| Struff, Jan-Lennard | | Zverev, Alexander |
| | Ungheria (2) |
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| Fucsovics, Marton | | Marozsan, Fabian |
| | Italia (5) |
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| Berrettini, Matteo | | Cobolli, Flavio | | Darderi, Luciano | | Musetti, Lorenzo | | Sonego, Lorenzo |
| | Giappone (1) |
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| Nishikori, Kei |
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| Russia (1) |
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| Khachanov, Karen |
| | Serbia (1) |
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| Kecmanovic, Miomir |
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| Davidovich Fokina, Alejandro |
| | Regno Unito (2) |
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| Draper, Jack | | Norrie, Cameron |
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| Stati Uniti (5) |
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| Giron, Marcos | | Michelsen, Alex | | Nakashima, Brandon | | Paul, Tommy | | Tiafoe, Frances |
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