| Argentina (6) |
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| Baez, Sebastian | | Bagnis, Facundo | | Cerundolo, Juan Manuel | | Coria, Federico | | Delbonis, Federico | | Schwartzman, Diego |
| | Austrália (6) |
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| De Minaur, Alex | | Kokkinakis, Thanasi | | Kyrgios, Nick | | Millman, John | | Popyrin, Alexei | | Thompson, Jordan |
| | Bielorrússia (1) |
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| Ivashka, Ilya |
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| Bulgária (1) |
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| Dimitrov, Grigor |
| | Canadá (2) |
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| Auger-Aliassime, Felix | | Shapovalov, Denis |
| | | Croácia (2) |
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| Cilic, Marin | | Coric, Borna |
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| República Checa (1) |
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| Machac, Tomas |
| | Dinamarca (1) |
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| Rune, Holger |
| | Finlândia (1) |
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| Ruusuvuori, Emil |
| | França (8) |
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| Bonzi, Benjamin | | Gasquet, Richard | | Gaston, Hugo | | Humbert, Ugo | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit | | Rinderknech, Arthur |
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| Geórgia (1) |
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| Basilashvili, Nikoloz |
| | Alemanha (6) |
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| Altmaier, Daniel | | Koepfer, Dominik | | Kohlschreiber, Philipp | | Otte, Oscar | | Struff, Jan-Lennard | | Zverev, Alexander |
| | 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 |
| | | Cazaquistão (2) |
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| Bublik, Alexander | | Kukushkin, Mikhail |
| | Holanda (2) |
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| Griekspoor, Tallon | | Zandschulp, Botic van de |
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| | Polónia (2) |
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| Hurkacz, Hubert | | Majchrzak, Kamil |
| | | Rússia (4) |
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| Karatsev, Aslan | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
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| Sérvia (4) |
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| Djere, Laslo | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
| | Eslovénia (1) |
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| Bedene, Aljaz |
| | África do Sul (1) |
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| Harris, Lloyd |
| | Coreia do Sul (1) |
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| Kwon, Soonwoo |
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| Espanha (9) |
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| Alcaraz, Carlos | | Andujar, Pablo | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Martinez, Pedro | | Munar, Jaume | | Nadal, Rafael |
| | Suíça (1) |
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| Laaksonen, Henri |
| | Reino Unido (4) |
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| Broady, Liam | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
| | Estados Unidos (17) |
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| Brooksby, Jenson | | Cressy, Maxime | | Eubanks, Christopher | | Fritz, Taylor | | Giron, Marcos | | Isner, John | | Johnson, Steve | | Korda, Sebastian | | McDonald, Mackenzie | | Nakashima, Brandon | | Opelka, Reilly | | Paul, Tommy | | Querrey, Sam | | Sandgren, Tennys | | Sock, Jack | | Tiafoe, Frances | | Wolf, J.J. |
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