| Argentina (7) |
|---|
| Andreozzi, Guido | | Del Potro, Juan Martin | | Delbonis, Federico | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego | | Zeballos, Horacio |
| | Australia (10) |
|---|
| Bolt, Alex | | De Minaur, Alex | | Duckworth, James | | Ebden, Matthew | | Kubler, Jason | | Kyrgios, Nick | | Millman, John | | Smith, John-Patrick | | Thompson, Jordan | | Tomic, Bernard |
| | Austria (2) |
|---|
| Novak, Dennis | | Thiem, Dominic |
| | Belgium (2) |
|---|
| Bemelmans, Ruben | | Goffin, David |
|
| Bosnia and Herzegovina (2) |
|---|
| Basic, Mirza | | Dzumhur, Damir |
| | Bulgaria (1) |
|---|
| Dimitrov, Grigor |
| | Canada (4) |
|---|
| Polansky, Peter | | Pospisil, Vasek | | Raonic, Milos | | Shapovalov, Denis |
| | Chile (2) |
|---|
| Garin, Christian | | Jarry, Nicolas |
|
| Croatia (3) |
|---|
| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
| | Cyprus (1) |
|---|
| Baghdatis, Marcos |
| | Czech Republic (1) |
|---|
| Vesely, Jiri |
| | France (12) |
|---|
| Barrere, Gregoire | | Benneteau, Julien | | Bonzi, Benjamin | | Chardy, Jeremy | | Gasquet, Richard | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas | | Robert, Stephane | | Simon, Gilles |
|
| Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germany (8) |
|---|
| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Maden, Yannick | | Marterer, Maximilian | | Mayer, Florian | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Greece (1) |
|---|
| Tsitsipas, Stefano |
| | Hungary (1) |
|---|
| Fucsovics, Marton |
|
| | | Italy (9) |
|---|
| Berrettini, Matteo | | Bolelli, Simone | | Cecchinato, Marco | | Fabbiano, Thomas | | Fognini, Fabio | | Lorenzi, Paolo | | Seppi, Andreas | | Sonego, Lorenzo | | Travaglia, Stefano |
| | Japan (4) |
|---|
| Daniel, Taro | | Nishikori, Kei | | Nishioka, Yoshihito | | Sugita, Yuichi |
|
| Kazakhstan (1) |
|---|
| Kukushkin, Mikhail |
| | Latvia (1) |
|---|
| Gulbis, Ernests |
| | Lithuania (1) |
|---|
| Berankis, Ricardas |
| | Luxembourg (1) |
|---|
| Muller, Gilles |
|
| | Netherlands (1) |
|---|
| Haase, Robin |
| | Poland (1) |
|---|
| Hurkacz, Hubert |
| | Portugal (2) |
|---|
| Elias, Gastao | | Sousa, Joao |
|
| | Russia (4) |
|---|
| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Youzhny, Mikhail |
| | Serbia (4) |
|---|
| Djere, Laslo | | Djokovic, Novak | | Krajinovic, Filip | | Lajovic, Dusan |
| | Slovakia (2) |
|---|
| Gombos, Norbert | | Lacko, Lukas |
|
| Slovenia (1) |
|---|
| Bedene, Aljaz |
| | South Africa (1) |
|---|
| Anderson, Kevin |
| | Spain (8) |
|---|
| Carballes Baena, Roberto | | Carreno Busta, Pablo | | Ferrer, David | | Garcia-Lopez, Guillermo | | Lopez, Feliciano | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Swiss (2) |
|---|
| Federer, Roger | | Wawrinka, Stan |
|
| | | Ukraine (1) |
|---|
| Stakhovsky, Sergiy |
| | United Kingdom (4) |
|---|
| Broady, Liam | | Clarke, Jay | | Edmund, Kyle | | Norrie, Cameron |
|
| United States (14) |
|---|
| Donaldson, Jared | | Fritz, Taylor | | Harrison, Christian | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Klahn, Bradley | | Kudla, Denis | | McDonald, Mackenzie | | Mmoh, Michael | | Querrey, Sam | | Sandgren, Tennys | | Sock, Jack | | Tiafoe, Frances |
| | | Uzbekistan (1) |
|---|
| Istomin, Denis |
|