| Argentina (7) |
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| Andreozzi, Guido | | Del Potro, Juan Martin | | Delbonis, Federico | | Londero, Juan Ignacio | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego |
| | Australia (6) |
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| De Minaur, Alex | | Ebden, Matthew | | Millman, John | | Popyrin, Alexei | | Thompson, Jordan | | Tomic, Bernard |
| | Østerrike (1) |
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| Thiem, Dominic |
| | Belgia (2) |
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| Coppejans, Kimmer | | Goffin, David |
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| | Bosnia og Herzegovina (1) |
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| Dzumhur, Damir |
| | Brasil (1) |
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| Monteiro, Thiago |
| | Bulgaria (1) |
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| Dimitrov, Grigor |
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| Canada (2) |
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| Auger-Aliassime, Felix | | Shapovalov, Denis |
| | Chile (2) |
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| Garin, Christian | | Jarry, Nicolas |
| | Kroatia (3) |
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| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
| | Tsjekkisk Republikk (2) |
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| Rosol, Lukas | | Vesely, Jiri |
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| Frankrike (17) |
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| Barrere, Gregoire | | Chardy, Jeremy | | Gasquet, Richard | | Halys, Quentin | | Herbert, Pierre-Hugues | | Hoang, Antoine | | Humbert, Ugo | | Janvier, Maxime | | Mahut, Nicolas | | Mannarino, Adrian | | Monfils, Gael | | Moutet, Corentin | | Muller, Alexandre | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles | | Tsonga, Jo-Wilfried |
| | Georgia (1) |
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| Basilashvili, Nikoloz |
| | Tyskland (11) |
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| Gojowczyk, Peter | | Hanfmann, Yannick | | Kohlschreiber, Philipp | | Maden, Yannick | | Marterer, Maximilian | | Molleker, Rudolf | | Otte, Oscar | | Stebe, Cedrik-Marcel | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Hellas (1) |
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| Tsitsipas, Stefano |
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| Ungarn (1) |
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| Fucsovics, Marton |
| | India (1) |
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| Gunneswaran, Prajnesh |
| | Italia (9) |
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| Berrettini, Matteo | | Bolelli, Simone | | Caruso, Salvatore | | Cecchinato, Marco | | Fabbiano, Thomas | | Fognini, Fabio | | Seppi, Andreas | | Sonego, Lorenzo | | Travaglia, Stefano |
| | Japan (3) |
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| Daniel, Taro | | Nishikori, Kei | | Nishioka, Yoshihito |
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| Kazakhstan (2) |
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| Bublik, Alexander | | Kukushkin, Mikhail |
| | Latvia (1) |
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| Gulbis, Ernests |
| | Litauen (1) |
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| Berankis, Ricardas |
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| Marokko (1) |
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| Benchetrit, Elliot |
| | Nederland (1) |
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| Haase, Robin |
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| | | Russland (3) |
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| Khachanov, Karen | | Medvedev, Daniil | | Vatutin, Alexey |
| | Serbia (6) |
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| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan | | Tipsarevic, Janko |
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| Slovakia (2) |
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| Klizan, Martin | | Kovalik, Jozef |
| | Slovenia (2) |
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| Bedene, Aljaz | | Rola, Blaz |
| | Sør-Afrika (1) |
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| Harris, Lloyd |
| | Spania (12) |
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| Andujar, Pablo | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Garcia-Lopez, Guillermo | | Lopez, Feliciano | | Martinez, Pedro | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
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| | Sveits (3) |
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| Federer, Roger | | Laaksonen, Henri | | Wawrinka, Stan |
| | | Ukraina (1) |
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| Stakhovsky, Sergiy |
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| England (3) |
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| Edmund, Kyle | | Evans, Daniel | | Norrie, Cameron |
| | Amerika (10) |
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| Fritz, Taylor | | Johnson, Steve | | Klahn, Bradley | | Kudla, Denis | | McDonald, Mackenzie | | Opelka, Reilly | | Paul, Tommy | | Querrey, Sam | | Sandgren, Tennys | | Tiafoe, Frances |
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