| Argentina (7) |
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| Baez, Sebastian | | Cachin, Pedro | | Cerundolo, Francisco | | Cerundolo, Juan Manuel | | Etcheverry, Tomas Martin | | Pella, Guido | | Schwartzman, Diego |
| | Austrália (5) |
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| De Minaur, Alex | | Kokkinakis, Thanasi | | Kubler, Jason | | O'Connell, Christopher | | Popyrin, Alexei |
| | Bielorrússia (1) |
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| Ivashka, Ilya |
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| | Brasil (1) |
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| Monteiro, Thiago |
| | Bulgária (1) |
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| Dimitrov, Grigor |
| | Canadá (1) |
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| Auger-Aliassime, Felix |
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| Chile (2) |
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| Garin, Christian | | Jarry, Nicolas |
| | | | República Checa (1) |
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| Lehecka, Jiri |
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| Dinamarca (1) |
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| Rune, Holger |
| | Finlândia (1) |
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| Ruusuvuori, Emil |
| | França (13) |
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| Assche, Luca Van | | Barrere, Gregoire | | Chardy, Jeremy | | Fils, Arthur | | Gasquet, Richard | | Grenier, Hugo | | Halys, Quentin | | Humbert, Ugo | | Lestienne, Constant | | Mannarino, Adrian | | Moutet, Corentin | | Muller, Alexandre | | Rinderknech, Arthur |
| | Alemanha (3) |
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| Altmaier, Daniel | | Hanfmann, Yannick | | Zverev, Alexander |
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| Grécia (1) |
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| Tsitsipas, Stefanos |
| | Hungria (2) |
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| Fucsovics, Marton | | Marozsan, Fabian |
| | Itália (11) |
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| Arnaldi, Matteo | | Cecchinato, Marco | | Cobolli, Flavio | | Fognini, Fabio | | Musetti, Lorenzo | | Napolitano, Stefano | | Nardi, Luca | | Passaro, Francesco | | Sinner, Jannik | | Sonego, Lorenzo | | Zeppieri, Giulio |
| | Japão (1) |
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| Nishioka, Yoshihito |
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| Cazaquistão (2) |
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| Bublik, Alexander | | Shevchenko, Alexander |
| | Holanda (2) |
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| Griekspoor, Tallon | | Zandschulp, Botic van de |
| | | Peru (1) |
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| Varillas, Juan Pablo |
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| Polónia (1) |
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| Hurkacz, Hubert |
| | | Rússia (4) |
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| Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey | | Safiullin, Roman |
| | Sérvia (5) |
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| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
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| Eslováquia (1) |
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| Molcan, Alex |
| | Espanha (8) |
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| Alcaraz, Carlos | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Davidovich Fokina, Alejandro | | Martinez, Pedro | | Munar, Jaume | | Ramos-Vinolas, Albert | | Zapata Miralles, Bernabe |
| | Suíça (2) |
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| Huesler, Marc-Andrea | | Wawrinka, Stan |
| | Reino Unido (4) |
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| Edmund, Kyle | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
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| Estados Unidos (10) |
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| Cressy, Maxime | | Fritz, Taylor | | Giron, Marcos | | Korda, Sebastian | | McDonald, Mackenzie | | Nakashima, Brandon | | Paul, Tommy | | Shelton, Ben | | Tiafoe, Frances | | Wolf, J.J. |
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