| Argentina (3) |
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| Coria, Federico | | Delbonis, Federico | | Schwartzman, Diego |
| | Australia (3) |
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| De Minaur, Alex | | Millman, John | | Thompson, Jordan |
| | | Canada (2) |
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| Auger-Aliassime, Felix | | Raonic, Milos |
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| Croazia (2) |
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| Cilic, Marin | | Coric, Borna |
| | Francia (8) |
|---|
| Bonzi, Benjamin | | Gasquet, Richard | | Gaston, Hugo | | Herbert, Pierre-Hugues | | Humbert, Ugo | | Mannarino, Adrian | | Moutet, Corentin | | Simon, Gilles |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germania (2) |
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| Struff, Jan-Lennard | | Zverev, Alexander |
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| Grecia (1) |
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| Tsitsipas, Stefano |
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| Fucsovics, Marton |
| | Italia (5) |
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| Berrettini, Matteo | | Caruso, Salvatore | | Cecchinato, Marco | | Sonego, Lorenzo | | Travaglia, Stefano |
| | Giappone (1) |
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| Nishioka, Yoshihito |
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| Bublik, Alexander |
| | | | Polonia (1) |
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| Hurkacz, Hubert |
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| Russia (3) |
|---|
| Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
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| Djere, Laslo | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
| | Slovacchia (1) |
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| Gombos, Norbert |
| | Slovenia (1) |
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| Bedene, Aljaz |
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| Sud Africa (1) |
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| Anderson, Kevin |
| | Spagna (6) |
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| Andujar, Pablo | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Lopez, Feliciano | | Nadal, Rafael | | Ramos-Vinolas, Albert |
| | Svizzera (1) |
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| Wawrinka, Stan |
| | Regno Unito (1) |
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| Evans, Daniel |
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| Stati Uniti (4) |
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| Fritz, Taylor | | Giron, Marcos | | Paul, Tommy | | Sandgren, Tennys |
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