| Argentina (5) |
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| Coria, Federico | | Delbonis, Federico | | Londero, Juan Ignacio | | Pella, Guido | | Schwartzman, Diego |
| | Australia (13) |
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| Bolt, Alex | | De Minaur, Alex | | Duckworth, James | | Kokkinakis, Thanasi | | Kyrgios, Nick | | Millman, John | | O'Connell, Christopher | | Polmans, Marc | | Popyrin, Alexei | | Thompson, Jordan | | Tomic, Bernard | | Tu, Li | | Vukic, Aleksandar |
| | Austria (2) |
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| Novak, Dennis | | Thiem, Dominic |
| | Bielorussia (2) |
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| Gerasimov, Egor | | Ivashka, Ilya |
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| Belgio (2) |
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| Coppejans, Kimmer | | Goffin, David |
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| Dzumhur, Damir |
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| Monteiro, Thiago |
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| Bulgaria (1) |
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| Dimitrov, Grigor |
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| Auger-Aliassime, Felix | | Pospisil, Vasek | | Raonic, Milos | | Shapovalov, Denis |
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| Cilic, Marin | | Coric, Borna |
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| Machac, Tomas | | Vesely, Jiri |
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| Torpegaard, Mikael |
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| Ruusuvuori, Emil |
| | Francia (10) |
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| Chardy, Jeremy | | Halys, Quentin | | Herbert, Pierre-Hugues | | Humbert, Ugo | | Mannarino, Adrian | | Monfils, Gael | | Moutet, Corentin | | Muller, Alexandre | | Paire, Benoit | | Simon, Gilles |
| | Georgia (1) |
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| Basilashvili, Nikoloz |
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| Germania (5) |
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| Hanfmann, Yannick | | Koepfer, Dominik | | Stebe, Cedrik-Marcel | | Struff, Jan-Lennard | | Zverev, Alexander |
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| Tsitsipas, Stefano |
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| Balazs, Attila | | Fucsovics, Marton |
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| Italia (9) |
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| Berrettini, Matteo | | Caruso, Salvatore | | Cecchinato, Marco | | Fognini, Fabio | | Mager, Gianluca | | Seppi, Andreas | | Sinner, Jannik | | Sonego, Lorenzo | | Travaglia, Stefano |
| | Giappone (5) |
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| Daniel, Taro | | Nishikori, Kei | | Nishioka, Yoshihito | | Sugita, Yuichi | | Uchiyama, Yasutaka |
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| Bublik, Alexander | | Kukushkin, Mikhail |
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| Ferreira Silva, Frederico | | Sousa, Pedro |
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| Karatsev, Aslan | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey | | Safiullin, Roman |
| | Serbia (6) |
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| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan | | Troicki, Viktor |
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| Gombos, Norbert | | Martin, Andrej |
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| Slovenia (1) |
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| Bedene, Aljaz |
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| Ymer, Elias | | Ymer, Mikael |
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| Stakhovsky, Sergiy |
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| Evans, Daniel | | Norrie, Cameron |
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