| Argentina (3) |
|---|
| Baez, Sebastian | | Cerundolo, Francisco | | Schwartzman, Diego |
| | Australia (2) |
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| De Minaur, Alex | | Popyrin, Alexei |
| | Austria (1) |
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| Thiem, Dominic |
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| | Bulgaria (1) |
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| Dimitrov, Grigor |
| | |
| República Checa (1) |
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| Lehecka, Jiri |
| | Dinamarca (1) |
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| Rune, Holger |
| | Finlandia (1) |
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| Ruusuvuori, Emil |
| | Francia (3) |
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| Bonzi, Benjamin | | Gasquet, Richard | | Humbert, Ugo |
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| Struff, Jan-Lennard | | Zverev, Alexander |
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| Tsitsipas, Stefanos |
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| Fucsovics, Marton |
| | Italia (5) |
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| Berrettini, Matteo | | Musetti, Lorenzo | | Nardi, Luca | | Sinner, Jannik | | Sonego, Lorenzo |
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| Kazajstán (1) |
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| Bublik, Alexander |
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| Griekspoor, Tallon | | Zandschulp, Botic van de |
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| Polonia (1) |
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| Hurkacz, Hubert |
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| Gakhov, Ivan | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
| | Serbia (5) |
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| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
| | España (5) |
|---|
| Bautista Agut, Roberto | | Davidovich Fokina, Alejandro | | Munar, Jaume | | Ramos-Vinolas, Albert | | Zapata Miralles, Bernabe |
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| Suiza (2) |
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| Huesler, Marc-Andrea | | Wawrinka, Stan |
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| Draper, Jack | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
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| Cressy, Maxime | | Fritz, Taylor | | McDonald, Mackenzie | | Shelton, Ben |
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