| Argentina (3) |
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| Delbonis, Federico | | Pella, Guido | | Schwartzman, Diego |
| | Australia (3) |
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| De Minaur, Alex | | Millman, John | | Popyrin, Alexei |
| | Austria (1) |
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| Thiem, Dominic |
| | Bulgaria (1) |
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| Dimitrov, Grigor |
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| Canada (2) |
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| Auger-Aliassime, Felix | | Shapovalov, Denis |
| | | Francia (5) |
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| Chardy, Jeremy | | Herbert, Pierre-Hugues | | Humbert, Ugo | | Mannarino, Adrian | | Paire, Benoit |
| | Georgia (1) |
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| Basilashvili, Nikoloz |
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| Germania (3) |
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| Koepfer, Dominik | | Struff, Jan-Lennard | | Zverev, Alexander |
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| Tsitsipas, Stefanos |
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| Fucsovics, Marton |
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| Berrettini, Matteo | | Cecchinato, Marco | | Fognini, Fabio | | Sinner, Jannik |
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| Giappone (2) |
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| Nishikori, Kei | | Nishioka, Yoshihito |
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| Bublik, Alexander |
| | | Polonia (1) |
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| Hurkacz, Hubert |
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| Russia (4) |
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| Karatsev, Aslan | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
| | Serbia (3) |
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| Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
| | Sud Africa (1) |
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| Harris, Lloyd |
| | Spagna (11) |
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| Alcaraz, Carlos | | Andujar, Pablo | | Bautista Agut, Roberto | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Martinez, Pedro | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Taberner, Carlos | | Verdasco, Fernando |
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| Regno Unito (2) |
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| Evans, Daniel | | Norrie, Cameron |
| | Stati Uniti (5) |
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| Fritz, Taylor | | Giron, Marcos | | Isner, John | | Opelka, Reilly | | Paul, Tommy |
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