| Argentina (2) |
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| Pella, Guido | | Schwartzman, Diego |
| | Austria (1) |
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| Thiem, Dominic |
| | Bulgaria (1) |
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| Dimitrov, Grigor |
| | Canada (1) |
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| Auger-Aliassime, Felix |
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| | Cina (2) |
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| Li, Zhe | | Zhang, Zhizhen |
| | Francia (3) |
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| Chardy, Jeremy | | Gasquet, Richard | | Monfils, Gael |
| | Georgia (1) |
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| Basilashvili, Nikoloz |
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| Zverev, Alexander |
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| Tsitsipas, Stefano |
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| Berrettini, Matteo | | Cecchinato, Marco | | Fognini, Fabio |
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| Kukushkin, Mikhail |
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| Russia (2) |
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| Khachanov, Karen | | Rublev, Andrey |
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| Bautista Agut, Roberto | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Regno Unito (4) |
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| Edmund, Kyle | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
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| Stati Uniti (3) |
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| Isner, John | | Querrey, Sam | | Tiafoe, Frances |
| |