| Argentina (6) |
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| Coria, Federico | | Delbonis, Federico | | Londero, Juan Ignacio | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego |
| | Australia (6) |
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| De Minaur, Alex | | Duckworth, James | | Millman, John | | O'Connell, Christopher | | Polmans, Marc | | Thompson, Jordan |
| | Austria (2) |
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| Novak, Dennis | | Thiem, Dominic |
| | Bielorussia (1) |
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| Gerasimov, Egor |
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| | | Bosnia-Erzegovina (1) |
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| Dzumhur, Damir |
| | Brasile (2) |
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| Monteiro, Thiago | | Seyboth Wild, Thiago |
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| Bulgaria (1) |
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| Dimitrov, Grigor |
| | Canada (4) |
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| Auger-Aliassime, Felix | | Pospisil, Vasek | | Raonic, Milos | | Shapovalov, Denis |
| | | Croazia (3) |
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| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
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| Repubblica Ceca (1) |
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| Vesely, Jiri |
| | Egitto (1) |
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| Safwat, Mohamed |
| | Finlandia (1) |
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| Ruusuvuori, Emil |
| | Francia (7) |
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| Barrere, Gregoire | | Chardy, Jeremy | | Gasquet, Richard | | Humbert, Ugo | | Mannarino, Adrian | | Moutet, Corentin | | Simon, Gilles |
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| Georgia (1) |
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| Basilashvili, Nikoloz |
| | Germania (5) |
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| Gojowczyk, Peter | | 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 | | Gaio, Federico | | Lorenzi, Paolo | | Mager, Gianluca | | Seppi, Andreas | | Sinner, Jannik | | Sonego, Lorenzo | | Travaglia, Stefano |
| | Giappone (5) |
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| Daniel, Taro | | Nishioka, Yoshihito | | Soeda, Go | | Sugita, Yuichi | | Uchiyama, Yasutaka |
| | Kazakistan (2) |
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| Bublik, Alexander | | Kukushkin, Mikhail |
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| Lituania (1) |
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| Berankis, Ricardas |
| | Messico (1) |
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| Escobedo, Ernesto |
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| Polonia (2) |
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| Hurkacz, Hubert | | Majchrzak, Kamil |
| | Portogallo (2) |
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| Sousa, Joao | | Sousa, Pedro |
| | Russia (5) |
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| Donskoy, Evgeny | | Khachanov, Karen | | Kuznetsov, Andrey | | Medvedev, Daniil | | Rublev, Andrey |
| | Serbia (5) |
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| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
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| Slovacchia (3) |
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| Gombos, Norbert | | Kovalik, Jozef | | Martin, Andrej |
| | 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 |
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| Spagna (10) |
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| Andujar, Pablo | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Granollers, Marcel | | Lopez, Feliciano | | Martinez, Pedro | | Munar, Jaume | | Ramos-Vinolas, Albert |
| | | | Regno Unito (4) |
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| Edmund, Kyle | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
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| Stati Uniti (21) |
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| Blanch, Ulises | | Cressy, Maxime | | Fritz, Taylor | | Giron, Marcos | | Isner, John | | Johnson, Steve | | Klahn, Bradley | | Korda, Sebastian | | Krueger, Mitchell | | Kudla, Denis | | Kwiatkowski, Thai-Son | | McDonald, Mackenzie | | Mmoh, Michael | | Nakashima, Brandon | | Opelka, Reilly | | Paul, Tommy | | Querrey, Sam | | Sandgren, Tennys | | Sock, Jack | | Tiafoe, Frances | | Wolf, J.J. |
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