| Argentina (6) |
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| Andreozzi, Guido | | Delbonis, Federico | | Londero, Juan Ignacio | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego |
| | Australia (7) |
|---|
| De Minaur, Alex | | Ebden, Matthew | | Kyrgios, Nick | | Millman, John | | Popyrin, Alexei | | Thompson, Jordan | | Tomic, Bernard |
| | Austria (2) |
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| Novak, Dennis | | Thiem, Dominic |
| | Belgio (3) |
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| Bemelmans, Ruben | | Darcis, Steve | | Goffin, David |
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| | Bosnia-Erzegovina (1) |
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| Dzumhur, Damir |
| | Brasile (1) |
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| Monteiro, Thiago |
| | Bulgaria (1) |
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| Dimitrov, Grigor |
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| Canada (5) |
|---|
| Auger-Aliassime, Felix | | Pospisil, Vasek | | Raonic, Milos | | Schnur, Brayden | | Shapovalov, Denis |
| | Cile (2) |
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| Garin, Christian | | Jarry, Nicolas |
| | Croazia (2) |
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| Cilic, Marin | | Karlovic, Ivo |
| | Cipro (1) |
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| Baghdatis, Marcos |
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| Repubblica Ceca (2) |
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| Berdych, Tomas | | Vesely, Jiri |
| | Francia (12) |
|---|
| 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 |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germania (7) |
|---|
| Gojowczyk, Peter | | Koepfer, Dominik | | Kohlschreiber, Philipp | | Stebe, Cedrik-Marcel | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
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| Grecia (1) |
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| Tsitsipas, Stefano |
| | Ungheria (1) |
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| Fucsovics, Marton |
| | India (1) |
|---|
| Gunneswaran, Prajnesh |
| | Italia (9) |
|---|
| Arnaboldi, Andrea | | Berrettini, Matteo | | Caruso, Salvatore | | Cecchinato, Marco | | Fabbiano, Thomas | | Fognini, Fabio | | Lorenzi, Paolo | | Seppi, Andreas | | Sonego, Lorenzo |
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| Giappone (4) |
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| Nishikori, Kei | | Nishioka, Yoshihito | | Sugita, Yuichi | | Uchiyama, Yasutaka |
| | Kazakistan (2) |
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| Bublik, Alexander | | Kukushkin, Mikhail |
| | Lettonia (1) |
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| Gulbis, Ernests |
| | Lituania (1) |
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| Berankis, Ricardas |
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| | | | Polonia (2) |
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| Hurkacz, Hubert | | Majchrzak, Kamil |
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| Portogallo (1) |
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| Sousa, Joao |
| | | Russia (3) |
|---|
| Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
| | Serbia (6) |
|---|
| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan | | Tipsarevic, Janko |
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| Slovacchia (2) |
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| Klizan, Martin | | Kovalik, Jozef |
| | Slovenia (1) |
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| Bedene, Aljaz |
| | Sud Africa (2) |
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| Anderson, Kevin | | Harris, Lloyd |
| | Corea del Sud (1) |
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| Kwon, Soonwoo |
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| Spagna (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 |
| | Svizzera (2) |
|---|
| Federer, Roger | | Wawrinka, Stan |
| | | Regno Unito (6) |
|---|
| Clarke, Jay | | Edmund, Kyle | | Evans, Daniel | | Jubb, Paul | | Norrie, Cameron | | Ward, James |
|
| Stati Uniti (11) |
|---|
| Fritz, Taylor | | Giron, Marcos | | Isner, John | | Johnson, Steve | | Klahn, Bradley | | Kudla, Denis | | Opelka, Reilly | | Querrey, Sam | | Rubin, Noah | | Sandgren, Tennys | | Tiafoe, Frances |
| | | Usbechistan (1) |
|---|
| Istomin, Denis |
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