| Argentina (8) |
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| Baez, Sebastian | | Bagnis, Facundo | | Cachin, Pedro | | Cerundolo, Francisco | | Coria, Federico | | Delbonis, Federico | | Etcheverry, Tomas Martin | | Schwartzman, Diego |
| | Austrália (10) |
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| De Minaur, Alex | | Duckworth, James | | Hijikata, Rinky | | Kokkinakis, Thanasi | | Kubler, Jason | | Kyrgios, Nick | | Millman, John | | O'Connell, Christopher | | Popyrin, Alexei | | Thompson, Jordan |
| | Áustria (1) |
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| Thiem, Dominic |
| | 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 (2) |
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| Auger-Aliassime, Felix | | Shapovalov, Denis |
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| Chile (3) |
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| Garin, Christian | | Jarry, Nicolas | | Tabilo, Alejandro |
| | China (2) |
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| Wu, Yibing | | Zhang, Zhizhen |
| | Colômbia (1) |
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| Galan, Daniel Elahi |
| | Croácia (2) |
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| Cilic, Marin | | Coric, Borna |
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| República Checa (3) |
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| Lehecka, Jiri | | Machac, Tomas | | Vesely, Jiri |
| | Dinamarca (1) |
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| Rune, Holger |
| | Finlândia (1) |
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| Ruusuvuori, Emil |
| | França (11) |
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| Bonzi, Benjamin | | Couacaud, Enzo | | Gasquet, Richard | | Gaston, Hugo | | Grenier, Hugo | | Halys, Quentin | | Humbert, Ugo | | Mannarino, Adrian | | Moutet, Corentin | | Paire, Benoit | | Rinderknech, Arthur |
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| Geórgia (1) |
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| Basilashvili, Nikoloz |
| | Alemanha (4) |
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| Altmaier, Daniel | | Gojowczyk, Peter | | Marterer, Maximilian | | Otte, Oscar |
| | Grécia (1) |
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| Tsitsipas, Stefanos |
| | Hungria (1) |
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| Fucsovics, Marton |
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| Itália (5) |
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| Berrettini, Matteo | | Fognini, Fabio | | Musetti, Lorenzo | | Sinner, Jannik | | Sonego, Lorenzo |
| | Japão (2) |
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| Daniel, Taro | | Nishioka, Yoshihito |
| | Cazaquistão (1) |
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| Bublik, Alexander |
| | Holanda (4) |
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| Brouwer, Gijs | | Griekspoor, Tallon | | Rijthoven, Tim van | | Zandschulp, Botic van de |
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| | Polónia (2) |
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| Hurkacz, Hubert | | Majchrzak, Kamil |
| | Portugal (2) |
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| Borges, Nuno | | Sousa, Joao |
| | Rússia (5) |
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| Karatsev, Aslan | | Khachanov, Karen | | Kotov, Pavel | | Medvedev, Daniil | | Rublev, Andrey |
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| Sérvia (4) |
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| Djere, Laslo | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
| | Eslováquia (2) |
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| Gombos, Norbert | | Molcan, Alex |
| | Eslovénia (1) |
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| Bedene, Aljaz |
| | Coreia do Sul (1) |
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| Kwon, Soonwoo |
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| Espanha (11) |
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| Alcaraz, Carlos | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Martinez, Pedro | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando | | Zapata Miralles, Bernabe |
| | | Suíça (3) |
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| Huesler, Marc-Andrea | | Ritschard, Alexander | | Wawrinka, Stan |
| | Taiwan (1) |
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| Tseng, Chun-Hsin |
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| Reino Unido (5) |
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| Draper, Jack | | Edmund, Kyle | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
| | Estados Unidos (21) |
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| Brooksby, Jenson | | Cressy, Maxime | | Eubanks, Christopher | | Fritz, Taylor | | Giron, Marcos | | Holt, Brandon | | Isner, John | | Johnson, Steve | | Korda, Sebastian | | Kozlov, Stefan | | Kudla, Denis | | McDonald, Mackenzie | | Nakashima, Brandon | | Nava, Emilio | | Paul, Tommy | | Querrey, Sam | | Shelton, Ben | | Sock, Jack | | Tiafoe, Frances | | Tien, Learner | | Wolf, J.J. |
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