| Argentina (5) |
|---|
| Andreozzi, Guido | | Delbonis, Federico | | Londero, Juan Ignacio | | Pella, Guido | | Schwartzman, Diego |
| | Australia (2) |
|---|
| Millman, John | | Popyrin, Alexei |
| | Austria (1) |
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| Thiem, Dominic |
| |
| Bosnia y Herzegovina (1) |
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| Dzumhur, Damir |
| | Bulgaria (1) |
|---|
| Dimitrov, Grigor |
| | Canadá (2) |
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| Auger-Aliassime, Felix | | Shapovalov, Denis |
| | Croacia (2) |
|---|
| Cilic, Marin | | Coric, Borna |
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| Francia (6) |
|---|
| Chardy, Jeremy | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | Pouille, Lucas | | Simon, Gilles | | Tsonga, Jo-Wilfried |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Alemania (3) |
|---|
| Kohlschreiber, Philipp | | Struff, Jan-Lennard | | Zverev, Alexander |
| | Grecia (1) |
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| Tsitsipas, Stefano |
|
| Hungría (1) |
|---|
| Fucsovics, Marton |
| | Italia (5) |
|---|
| Berrettini, Matteo | | Cecchinato, Marco | | Fognini, Fabio | | Seppi, Andreas | | Sonego, Lorenzo |
| | Japón (2) |
|---|
| Daniel, Taro | | Nishikori, Kei |
| | Kazajstán (1) |
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| Kukushkin, Mikhail |
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| | Mónaco (1) |
|---|
| Catarina, Lucas |
| | Polonia (1) |
|---|
| Hurkacz, Hubert |
| |
| Rusia (3) |
|---|
| Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
| | Serbia (3) |
|---|
| Djere, Laslo | | Djokovic, Novak | | Lajovic, Dusan |
| | Eslovaquia (1) |
|---|
| Klizan, Martin |
| | Eslovenia (1) |
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| Bedene, Aljaz |
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| España (4) |
|---|
| Bautista Agut, Roberto | | Munar, Jaume | | Nadal, Rafael | | Verdasco, Fernando |
| | | | Reino Unido (2) |
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| Edmund, Kyle | | Norrie, Cameron |
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| Estados Unidos (1) |
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| Fritz, Taylor |
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