| Argentina (5) |
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| Coria, Federico | | Delbonis, Federico | | Londero, Juan Ignacio | | Pella, Guido | | Schwartzman, Diego |
| | Australia (7) |
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| De Minaur, Alex | | Duckworth, James | | Millman, John | | Polmans, Marc | | Popyrin, Alexei | | Thompson, Jordan | | Vukic, Aleksandar |
| | Austria (3) |
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| Novak, Dennis | | Rodionov, Jurij | | Thiem, Dominic |
| | Bielorussia (1) |
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| Gerasimov, Egor |
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| | | Brasile (1) |
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| Monteiro, Thiago |
| | Bulgaria (1) |
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| Dimitrov, Grigor |
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| Canada (4) |
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| Auger-Aliassime, Felix | | Diez, Steven | | Pospisil, Vasek | | Shapovalov, Denis |
| | | Colombia (1) |
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| Galan, Daniel Elahi |
| | Croazia (2) |
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| Cilic, Marin | | Coric, Borna |
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| Repubblica Ceca (2) |
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| Machac, Tomas | | Vesely, Jiri |
| | | Finlandia (1) |
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| Ruusuvuori, Emil |
| | Francia (17) |
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| Barrere, Gregoire | | Bonzi, Benjamin | | Chardy, Jeremy | | Gasquet, Richard | | Gaston, Hugo | | Halys, Quentin | | Herbert, Pierre-Hugues | | Hoang, Antoine | | Humbert, Ugo | | Janvier, Maxime | | Mannarino, Adrian | | Mayot, Harold | | Monfils, Gael | | Moutet, Corentin | | Paire, Benoit | | Rinderknech, Arthur | | Simon, Gilles |
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| Georgia (1) |
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| Basilashvili, Nikoloz |
| | Germania (5) |
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| Altmaier, Daniel | | Koepfer, Dominik | | Kohlschreiber, Philipp | | Struff, Jan-Lennard | | Zverev, Alexander |
| | Grecia (1) |
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| Tsitsipas, Stefano |
| | Ungheria (2) |
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| Balazs, Attila | | Fucsovics, Marton |
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| Italia (10) |
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| Berrettini, Matteo | | Caruso, Salvatore | | Cecchinato, Marco | | Fognini, Fabio | | Giustino, Lorenzo | | Mager, Gianluca | | Seppi, Andreas | | Sinner, Jannik | | Sonego, Lorenzo | | Travaglia, Stefano |
| | Giappone (4) |
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| Nishikori, Kei | | Nishioka, Yoshihito | | Sugita, Yuichi | | Uchiyama, Yasutaka |
| | Kazakistan (2) |
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| Bublik, Alexander | | Kukushkin, Mikhail |
| | Lituania (1) |
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| Berankis, Ricardas |
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| | Marocco (1) |
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| Benchetrit, Elliot |
| | | Polonia (2) |
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| Hurkacz, Hubert | | Majchrzak, Kamil |
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| Portogallo (1) |
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| Sousa, Joao |
| | Russia (3) |
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| Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
| | Serbia (6) |
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| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan | | Milojevic, Nikola |
| | Slovacchia (2) |
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| Gombos, Norbert | | Martin, Andrej |
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| Slovenia (1) |
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| Bedene, Aljaz |
| | Sud Africa (2) |
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| Anderson, Kevin | | Harris, Lloyd |
| | Corea del Sud (1) |
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| Kwon, Soonwoo |
| | Spagna (10) |
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| Andujar, Pablo | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Lopez, Feliciano | | Martinez, Pedro | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert |
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| | Svizzera (2) |
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| Laaksonen, Henri | | Wawrinka, Stan |
| | | Regno Unito (4) |
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| Broady, Liam | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
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| Stati Uniti (13) |
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| Fritz, Taylor | | Giron, Marcos | | Isner, John | | Johnson, Steve | | Korda, Sebastian | | McDonald, Mackenzie | | Mmoh, Michael | | Opelka, Reilly | | Paul, Tommy | | Querrey, Sam | | Sandgren, Tennys | | Sock, Jack | | Tiafoe, Frances |
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