| Argentina (5) |
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| Andreozzi, Guido | | Delbonis, Federico | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego |
| | Australia (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 |
| | Østerrike (1) |
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| Thiem, Dominic |
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| Belgia (2) |
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| Darcis, Steve | | Goffin, David |
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| Basic, Mirza | | Dzumhur, Damir |
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| Dimitrov, Grigor |
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| Raonic, Milos | | Shapovalov, Denis |
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| Chile (2) |
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| Garin, Christian | | Jarry, Nicolas |
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| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
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| Berdych, Tomas | | Vesely, Jiri |
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| Frankrike (10) |
|---|
| Chardy, Jeremy | | Herbert, Pierre-Hugues | | Humbert, Ugo | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas | | Sakharov, Gleb | | Simon, Gilles | | Tsonga, Jo-Wilfried |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
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|---|
| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Marterer, Maximilian | | Molleker, Rudolf | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
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| Tsitsipas, Stefano |
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| Fucsovics, Marton |
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|---|
| Gunneswaran, Prajnesh |
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| Berrettini, Matteo | | Cecchinato, Marco | | Fabbiano, Thomas | | Fognini, Fabio | | Seppi, Andreas | | Travaglia, Stefano | | Vanni, Luca |
| | Japan (4) |
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| Daniel, Taro | | Ito, Tatsuma | | Nishikori, Kei | | Nishioka, Yoshihito |
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| Kazakhstan (1) |
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| Kukushkin, Mikhail |
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| Haase, Robin |
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| Sousa, Joao | | Sousa, Pedro |
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| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
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| Serbia (7) |
|---|
| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan | | Tipsarevic, Janko | | Troicki, Viktor |
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| Klizan, Martin |
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| Bedene, Aljaz |
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| Chung, Hyeon |
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| | Sveits (3) |
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| Federer, Roger | | Laaksonen, Henri | | Wawrinka, Stan |
| |
| England (4) |
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| Edmund, Kyle | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
| | Amerika (16) |
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| | | Uzbekistan (1) |
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| Istomin, Denis |
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