| Argentina (5) |
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| Andreozzi, Guido | | Delbonis, Federico | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego |
| | Australia (12) |
|---|
| 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 |
| | Austria (1) |
|---|
| Thiem, Dominic |
| | Bielorussia (1) |
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| Ivashka, Ilya |
|
| Belgio (2) |
|---|
| 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 |
|
| Cile (2) |
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| Garin, Christian | | Jarry, Nicolas |
| | | Croazia (3) |
|---|
| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
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| Berdych, Tomas | | Vesely, Jiri |
|
| Francia (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 |
| | Germania (7) |
|---|
| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Marterer, Maximilian | | Molleker, Rudolf | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Grecia (1) |
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| Tsitsipas, Stefano |
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| Ungheria (1) |
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| Fucsovics, Marton |
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|---|
| Gunneswaran, Prajnesh |
| | Italia (7) |
|---|
| Berrettini, Matteo | | Cecchinato, Marco | | Fabbiano, Thomas | | Fognini, Fabio | | Seppi, Andreas | | Travaglia, Stefano | | Vanni, Luca |
| | Giappone (4) |
|---|
| Daniel, Taro | | Ito, Tatsuma | | Nishikori, Kei | | Nishioka, Yoshihito |
|
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| Kukushkin, Mikhail |
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| Gulbis, Ernests |
| | |
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| Sousa, Joao | | Sousa, Pedro |
| | | Russia (4) |
|---|
| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
|
| 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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|---|
| Anderson, Kevin | | Harris, Lloyd |
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| Chung, Hyeon |
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|---|
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| | Svizzera (3) |
|---|
| Federer, Roger | | Laaksonen, Henri | | Wawrinka, Stan |
| |
| Regno Unito (4) |
|---|
| Edmund, Kyle | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
| | Stati Uniti (16) |
|---|
| 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 |
| | | Usbechistan (1) |
|---|
| Istomin, Denis |
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