| Argentina (5) |
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| Andreozzi, Guido | | Delbonis, Federico | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego |
| | Austrália (12) |
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| Bolt, Alex | | De Minaur, Alex | | Duckworth, James | | Ebden, Matthew | | Kokkinakis, Thanasi | | Kubler, Jason | | Kyrgios, Nick | | Millman, John | | Polmans, Marc | | Popyrin, Alexei | | Thompson, Jordan | | Tomic, Bernard |
| | Áustria (1) |
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| Thiem, Dominic |
| | Bielorrússia (1) |
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| Ivashka, Ilya |
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| Bélgica (2) |
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| Darcis, Steve | | Goffin, David |
| | Bósnia Herzegovina (2) |
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| Basic, Mirza | | Dzumhur, Damir |
| | Bulgária (1) |
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| Dimitrov, Grigor |
| | Canadá (2) |
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| Raonic, Milos | | Shapovalov, Denis |
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| Chile (2) |
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| Garin, Christian | | Jarry, Nicolas |
| | | Croácia (3) |
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| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
| | República Checa (2) |
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| Berdych, Tomas | | Vesely, Jiri |
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| França (10) |
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| Chardy, Jeremy | | Herbert, Pierre-Hugues | | Humbert, Ugo | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas | | Sakharov, Gleb | | Simon, Gilles | | Tsonga, Jo-Wilfried |
| | Geórgia (1) |
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| Basilashvili, Nikoloz |
| | Alemanha (7) |
|---|
| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Marterer, Maximilian | | Molleker, Rudolf | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Grécia (1) |
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| Tsitsipas, Stefano |
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| Hungria (1) |
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| Fucsovics, Marton |
| | Índia (1) |
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| Gunneswaran, Prajnesh |
| | Itália (7) |
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| Berrettini, Matteo | | Cecchinato, Marco | | Fabbiano, Thomas | | Fognini, Fabio | | Seppi, Andreas | | Travaglia, Stefano | | Vanni, Luca |
| | Japão (4) |
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| Daniel, Taro | | Ito, Tatsuma | | Nishikori, Kei | | Nishioka, Yoshihito |
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| Cazaquistão (1) |
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| Kukushkin, Mikhail |
| | Letónia (1) |
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| Gulbis, Ernests |
| | |
| Polónia (2) |
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| Hurkacz, Hubert | | Majchrzak, Kamil |
| | Portugal (2) |
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| Sousa, Joao | | Sousa, Pedro |
| | | Rússia (4) |
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| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
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| Sérvia (7) |
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| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan | | Tipsarevic, Janko | | Troicki, Viktor |
| | Eslováquia (1) |
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| Klizan, Martin |
| | Eslovénia (1) |
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| Bedene, Aljaz |
| | África do Sul (2) |
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| Anderson, Kevin | | Harris, Lloyd |
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| Coreia do Sul (1) |
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| Chung, Hyeon |
| | Espanha (11) |
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| Andujar, Pablo | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Garcia-Lopez, Guillermo | | Granollers, Marcel | | Lopez, Feliciano | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Suíça (3) |
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| Federer, Roger | | Laaksonen, Henri | | Wawrinka, Stan |
| |
| Reino Unido (4) |
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| Edmund, Kyle | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
| | Estados Unidos (16) |
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| Eubanks, Christopher | | Fratangelo, Bjorn | | Fritz, Taylor | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Klahn, Bradley | | Krueger, Mitchell | | Kudla, Denis | | McDonald, Mackenzie | | Mmoh, Michael | | Opelka, Reilly | | Querrey, Sam | | Sandgren, Tennys | | Sock, Jack | | Tiafoe, Frances |
| | | Uzbequistão (1) |
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| Istomin, Denis |
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