| Argentina (6) |
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| Andreozzi, Guido | | Delbonis, Federico | | Londero, Juan Ignacio | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego |
| | Austrália (7) |
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| De Minaur, Alex | | Ebden, Matthew | | Kyrgios, Nick | | Millman, John | | Popyrin, Alexei | | Thompson, Jordan | | Tomic, Bernard |
| | Áustria (2) |
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| Novak, Dennis | | Thiem, Dominic |
| | Bélgica (3) |
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| Bemelmans, Ruben | | Darcis, Steve | | Goffin, David |
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| | Bósnia Herzegovina (1) |
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| Dzumhur, Damir |
| | Brasil (1) |
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| Monteiro, Thiago |
| | Bulgária (1) |
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| Dimitrov, Grigor |
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| Canadá (5) |
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| Auger-Aliassime, Felix | | Pospisil, Vasek | | Raonic, Milos | | Schnur, Brayden | | Shapovalov, Denis |
| | Chile (2) |
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| Garin, Christian | | Jarry, Nicolas |
| | Croácia (2) |
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| Cilic, Marin | | Karlovic, Ivo |
| | Chipre (1) |
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| Baghdatis, Marcos |
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| República Checa (2) |
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| Berdych, Tomas | | Vesely, Jiri |
| | França (12) |
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| Barrere, Gregoire | | Chardy, Jeremy | | Gasquet, Richard | | Herbert, Pierre-Hugues | | Humbert, Ugo | | Mannarino, Adrian | | Monfils, Gael | | Moutet, Corentin | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles | | Tsonga, Jo-Wilfried |
| | Geórgia (1) |
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| Basilashvili, Nikoloz |
| | Alemanha (7) |
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| Gojowczyk, Peter | | Koepfer, Dominik | | Kohlschreiber, Philipp | | Stebe, Cedrik-Marcel | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
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| Grécia (1) |
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| Tsitsipas, Stefano |
| | Hungria (1) |
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| Fucsovics, Marton |
| | Índia (1) |
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| Gunneswaran, Prajnesh |
| | Itália (9) |
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| Arnaboldi, Andrea | | Berrettini, Matteo | | Caruso, Salvatore | | Cecchinato, Marco | | Fabbiano, Thomas | | Fognini, Fabio | | Lorenzi, Paolo | | Seppi, Andreas | | Sonego, Lorenzo |
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| Japão (4) |
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| Nishikori, Kei | | Nishioka, Yoshihito | | Sugita, Yuichi | | Uchiyama, Yasutaka |
| | Cazaquistão (2) |
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| Bublik, Alexander | | Kukushkin, Mikhail |
| | Letónia (1) |
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| Gulbis, Ernests |
| | Lituânia (1) |
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| Berankis, Ricardas |
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| | | | Polónia (2) |
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| Hurkacz, Hubert | | Majchrzak, Kamil |
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| | | Rússia (3) |
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| Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
| | Sérvia (6) |
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| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan | | Tipsarevic, Janko |
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| Eslováquia (2) |
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| Klizan, Martin | | Kovalik, Jozef |
| | 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 |
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| Espanha (10) |
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| Andujar, Pablo | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Granollers, Marcel | | Lopez, Feliciano | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Suíça (2) |
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| Federer, Roger | | Wawrinka, Stan |
| | | Reino Unido (6) |
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| Clarke, Jay | | Edmund, Kyle | | Evans, Daniel | | Jubb, Paul | | Norrie, Cameron | | Ward, James |
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| Estados Unidos (11) |
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| Fritz, Taylor | | Giron, Marcos | | Isner, John | | Johnson, Steve | | Klahn, Bradley | | Kudla, Denis | | Opelka, Reilly | | Querrey, Sam | | Rubin, Noah | | Sandgren, Tennys | | Tiafoe, Frances |
| | | Uzbequistão (1) |
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| Istomin, Denis |
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