| Argentina (6) |
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| Delbonis, Federico | | Londero, Juan Ignacio | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego | | Trungelliti, Marco |
| | Australia (11) |
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| Bolt, Alex | | Duckworth, James | | Harris, Andrew | | Kyrgios, Nick | | Millman, John | | O'Connell, Christopher | | Polmans, Marc | | Popyrin, Alexei | | Purcell, Max | | Smith, John-Patrick | | Thompson, Jordan |
| | Austria (2) |
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| Novak, Dennis | | Thiem, Dominic |
| | Belarús (2) |
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| Gerasimov, Egor | | Ivashka, Ilya |
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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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| Garin, Christian | | Tabilo, Alejandro |
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| Galan, Daniel Elahi |
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| Croacia (3) |
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| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
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| Safwat, Mohamed |
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| Barrere, Gregoire | | Chardy, Jeremy | | Gaston, Hugo | | Halys, Quentin | | Herbert, Pierre-Hugues | | Humbert, Ugo | | Mannarino, Adrian | | Monfils, Gael | | Moutet, Corentin | | Paire, Benoit | | Simon, Gilles | | Tsonga, Jo-Wilfried |
| | Georgia (1) |
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| Basilashvili, Nikoloz |
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| Alemania (6) |
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| Gojowczyk, Peter | | Koepfer, Dominik | | Kohlschreiber, Philipp | | Stebe, Cedrik-Marcel | | Struff, Jan-Lennard | | Zverev, Alexander |
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| Tsitsipas, Stefano |
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| Fucsovics, Marton |
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| Gunneswaran, Prajnesh |
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| Italia (9) |
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| Berrettini, Matteo | | Caruso, Salvatore | | Cecchinato, Marco | | Fognini, Fabio | | Giustino, Lorenzo | | Seppi, Andreas | | Sinner, Jannik | | Sonego, Lorenzo | | Travaglia, Stefano |
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| Ito, Tatsuma | | Nishioka, Yoshihito | | Sugita, Yuichi | | Uchiyama, Yasutaka |
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| Hurkacz, Hubert |
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| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
| | Serbia (5) |
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| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
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| Anderson, Kevin | | Harris, Lloyd |
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| Kwon, Soonwoo |
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| España (12) |
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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 | | Verdasco, Fernando | | Vilella Martinez, Mario |
| | | Suiza (2) |
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| Federer, Roger | | Wawrinka, Stan |
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| Reino Unido (3) |
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| Edmund, Kyle | | Evans, Daniel | | Norrie, Cameron |
| | Estados Unidos (12) |
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| Eubanks, Christopher | | Fritz, Taylor | | Giron, Marcos | | Isner, John | | Johnson, Steve | | McDonald, Mackenzie | | Mmoh, Michael | | Opelka, Reilly | | Paul, Tommy | | Querrey, Sam | | Sandgren, Tennys | | Tiafoe, Frances |
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