| Argentina (8) |
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| Andreozzi, Guido | | Del Potro, Juan Martin | | Delbonis, Federico | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego | | Trungelliti, Marco | | Zeballos, Horacio |
| | Australien (7) |
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| De Minaur, Alex | | Duckworth, James | | Ebden, Matthew | | Kyrgios, Nick | | Millman, John | | Thompson, Jordan | | Tomic, Bernard |
| | Østrig (2) |
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| Haider-Maurer, Andreas | | Thiem, Dominic |
| | Hviderusland (1) |
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| Ivashka, Ilya |
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| Belgien (2) |
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| Bemelmans, Ruben | | Goffin, David |
| | Bosnien og Herzegovina (2) |
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| Basic, Mirza | | Dzumhur, Damir |
| | Brasilien (2) |
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| Bellucci, Thomaz | | Dutra Silva, Rogerio |
| | Bulgarien (1) |
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| Dimitrov, Grigor |
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| Canada (3) |
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| Polansky, Peter | | Pospisil, Vasek | | Shapovalov, Denis |
| | | Colombia (1) |
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| Giraldo, Santiago |
| | Kroatien (3) |
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| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
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| Cypern (1) |
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| Baghdatis, Marcos |
| | Tjekkiet (3) |
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| Berdych, Tomas | | Pavlasek, Adam | | Vesely, Jiri |
| | Egypten (1) |
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| Safwat, Mohamed |
| |
| Frankrig (14) |
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| Barrere, Gregoire | | Benneteau, Julien | | Chardy, Jeremy | | Gasquet, Richard | | Hemery, Calvin | | Herbert, Pierre-Hugues | | Janvier, Maxime | | Mahut, Nicolas | | Mannarino, Adrian | | Monfils, Gael | | Moutet, Corentin | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles |
| | Georgien (1) |
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| Basilashvili, Nikoloz |
| | Tyskland (8) |
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| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Marterer, Maximilian | | Mayer, Florian | | Otte, Oscar | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Grækenland (1) |
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| Tsitsipas, Stefano |
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| Ungarn (1) |
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| Fucsovics, Marton |
| | Indien (2) |
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| Bhambri, Yuki | | Gunneswaran, Prajnesh |
| | | Italien (7) |
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| Berrettini, Matteo | | Bolelli, Simone | | Cecchinato, Marco | | Fabbiano, Thomas | | Fognini, Fabio | | Lorenzi, Paolo | | Seppi, Andreas |
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| Japan (3) |
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| Nishikori, Kei | | Nishioka, Yoshihito | | Sugita, Yuichi |
| | Kasakhstan (1) |
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| Kukushkin, Mikhail |
| | Letland (1) |
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| Gulbis, Ernests |
| | Litauen (1) |
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| Berankis, Ricardas |
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| Luxembourg (1) |
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| Muller, Gilles |
| | | Marokko (1) |
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| Benchetrit, Elliot |
| |
| | | | Rumænien (1) |
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| Copil, Marius |
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| Rusland (4) |
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| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Youzhny, Mikhail |
| | Serbien (4) |
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| Djere, Laslo | | Djokovic, Novak | | Lajovic, Dusan | | Troicki, Viktor |
| | Slovakiet (2) |
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| Klizan, Martin | | Kovalik, Jozef |
| | Slovenien (1) |
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| Bedene, Aljaz |
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| Sydafrika (1) |
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| Anderson, Kevin |
| | Spanien (12) |
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| Andujar, Pablo | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Ferrer, David | | Garcia-Lopez, Guillermo | | Lopez, Feliciano | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Taberner, Carlos | | Verdasco, Fernando |
| | | Schweizisk (1) |
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| Wawrinka, Stan |
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| | Tunesien (1) |
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| Jaziri, Malek |
| | Ukraine (1) |
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| Stakhovsky, Sergiy |
| | Storbritannien (2) |
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| Edmund, Kyle | | Norrie, Cameron |
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| USA (11) |
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| Donaldson, Jared | | Fritz, Taylor | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Kudla, Denis | | Querrey, Sam | | Rubin, Noah | | Sandgren, Tennys | | Sock, Jack | | Tiafoe, Frances |
| | | Usbekistan (1) |
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| Istomin, Denis |
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