| Argentina (8) |
|---|
| Andreozzi, Guido | | Del Potro, Juan Martin | | Delbonis, Federico | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego | | Trungelliti, Marco | | Zeballos, Horacio |
| | Australia (7) |
|---|
| De Minaur, Alex | | Duckworth, James | | Ebden, Matthew | | Kyrgios, Nick | | Millman, John | | Thompson, Jordan | | Tomic, Bernard |
| | Austria (2) |
|---|
| Haider-Maurer, Andreas | | Thiem, Dominic |
| |
| Belgium (2) |
|---|
| Bemelmans, Ruben | | Goffin, David |
| | Bosnia and Herzegovina (2) |
|---|
| Basic, Mirza | | Dzumhur, Damir |
| | Brasil (2) |
|---|
| Bellucci, Thomaz | | Dutra Silva, Rogerio |
| | Bulgaria (1) |
|---|
| Dimitrov, Grigor |
|
| Canada (3) |
|---|
| Polansky, Peter | | Pospisil, Vasek | | Shapovalov, Denis |
| | | Colombia (1) |
|---|
| Giraldo, Santiago |
| | Croatia (3) |
|---|
| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
|
| Cyprus (1) |
|---|
| Baghdatis, Marcos |
| | Czech Republic (3) |
|---|
| Berdych, Tomas | | Pavlasek, Adam | | Vesely, Jiri |
| | |
| France (14) |
|---|
| 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 |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germany (8) |
|---|
| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Marterer, Maximilian | | Mayer, Florian | | Otte, Oscar | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Greece (1) |
|---|
| Tsitsipas, Stefano |
|
| Hungary (1) |
|---|
| Fucsovics, Marton |
| | India (2) |
|---|
| Bhambri, Yuki | | Gunneswaran, Prajnesh |
| | | Italy (7) |
|---|
| Berrettini, Matteo | | Bolelli, Simone | | Cecchinato, Marco | | Fabbiano, Thomas | | Fognini, Fabio | | Lorenzi, Paolo | | Seppi, Andreas |
|
| Japan (3) |
|---|
| Nishikori, Kei | | Nishioka, Yoshihito | | Sugita, Yuichi |
| | Kazakhstan (1) |
|---|
| Kukushkin, Mikhail |
| | Latvia (1) |
|---|
| Gulbis, Ernests |
| | Lithuania (1) |
|---|
| Berankis, Ricardas |
|
| Luxembourg (1) |
|---|
| Muller, Gilles |
| | | Morocco (1) |
|---|
| Benchetrit, Elliot |
| | Netherlands (1) |
|---|
| Haase, Robin |
|
| | Poland (1) |
|---|
| Hurkacz, Hubert |
| | |
| Russia (4) |
|---|
| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Youzhny, Mikhail |
| | Serbia (4) |
|---|
| Djere, Laslo | | Djokovic, Novak | | Lajovic, Dusan | | Troicki, Viktor |
| | Slovakia (2) |
|---|
| Klizan, Martin | | Kovalik, Jozef |
| | Slovenia (1) |
|---|
| Bedene, Aljaz |
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| South Africa (1) |
|---|
| Anderson, Kevin |
| | Spain (12) |
|---|
| 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 |
| | |
| | | Ukraine (1) |
|---|
| Stakhovsky, Sergiy |
| | United Kingdom (2) |
|---|
| Edmund, Kyle | | Norrie, Cameron |
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| United States (11) |
|---|
| Donaldson, Jared | | Fritz, Taylor | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Kudla, Denis | | Querrey, Sam | | Rubin, Noah | | Sandgren, Tennys | | Sock, Jack | | Tiafoe, Frances |
| | | Uzbekistan (1) |
|---|
| Istomin, Denis |
|