| Argentina (5) |
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| Coria, Federico | | Delbonis, Federico | | Londero, Juan Ignacio | | Pella, Guido | | Schwartzman, Diego |
| | Austrália (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 |
| | Áustria (2) |
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| Novak, Dennis | | Thiem, Dominic |
| | Bielorrússia (2) |
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| Gerasimov, Egor | | Ivashka, Ilya |
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| Bélgica (2) |
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| Coppejans, Kimmer | | Goffin, David |
| | | Bósnia Herzegovina (1) |
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| Dzumhur, Damir |
| | Brasil (1) |
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| Monteiro, Thiago |
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| Bulgária (1) |
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| Dimitrov, Grigor |
| | Canadá (4) |
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| Auger-Aliassime, Felix | | Pospisil, Vasek | | Raonic, Milos | | Shapovalov, Denis |
| | Croácia (2) |
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| Cilic, Marin | | Coric, Borna |
| | República Checa (2) |
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| Machac, Tomas | | Vesely, Jiri |
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| Dinamarca (1) |
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| Torpegaard, Mikael |
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| Ruusuvuori, Emil |
| | França (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 |
| | Geórgia (1) |
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| Basilashvili, Nikoloz |
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| Alemanha (5) |
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| Hanfmann, Yannick | | Koepfer, Dominik | | Stebe, Cedrik-Marcel | | Struff, Jan-Lennard | | Zverev, Alexander |
| | Grécia (1) |
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| Tsitsipas, Stefano |
| | Hungria (2) |
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| Balazs, Attila | | Fucsovics, Marton |
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| Itália (9) |
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| Berrettini, Matteo | | Caruso, Salvatore | | Cecchinato, Marco | | Fognini, Fabio | | Mager, Gianluca | | Seppi, Andreas | | Sinner, Jannik | | Sonego, Lorenzo | | Travaglia, Stefano |
| | Japão (5) |
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| Daniel, Taro | | Nishikori, Kei | | Nishioka, Yoshihito | | Sugita, Yuichi | | Uchiyama, Yasutaka |
| | Cazaquistão (2) |
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| Bublik, Alexander | | Kukushkin, Mikhail |
| | Lituânia (1) |
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| Berankis, Ricardas |
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| | Holanda (2) |
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| Haase, Robin | | Zandschulp, Botic van de |
| | | Polónia (2) |
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| Hurkacz, Hubert | | Majchrzak, Kamil |
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| Portugal (2) |
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| Ferreira Silva, Frederico | | Sousa, Pedro |
| | Rússia (5) |
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| Karatsev, Aslan | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey | | Safiullin, Roman |
| | Sérvia (6) |
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| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan | | Troicki, Viktor |
| | Eslováquia (2) |
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| Gombos, Norbert | | Martin, Andrej |
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| Eslovénia (1) |
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| Bedene, Aljaz |
| | África do Sul (2) |
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| Anderson, Kevin | | Harris, Lloyd |
| | Coreia do Sul (1) |
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| Kwon, Soonwoo |
| | Espanha (10) |
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| Alcaraz, Carlos | | Andujar, Pablo | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Lopez, Feliciano | | Martinez, Pedro | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Vilella Martinez, Mario |
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| Suécia (2) |
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| Ymer, Elias | | Ymer, Mikael |
| | Suíça (2) |
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| Laaksonen, Henri | | Wawrinka, Stan |
| | | Ucrânia (1) |
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| Stakhovsky, Sergiy |
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| Reino Unido (2) |
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| Evans, Daniel | | Norrie, Cameron |
| | Estados Unidos (10) |
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| Cressy, Maxime | | Fritz, Taylor | | Giron, Marcos | | McDonald, Mackenzie | | Mmoh, Michael | | Opelka, Reilly | | Paul, Tommy | | Querrey, Sam | | Sandgren, Tennys | | Tiafoe, Frances |
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