| Argentina (7) |
|---|
| Del Potro, Juan Martin | | Delbonis, Federico | | Kicker, Nicolas | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego | | Zeballos, Horacio |
| | Australia (9) |
|---|
| Bolt, Alex | | De Minaur, Alex | | Ebden, Matthew | | Kokkinakis, Thanasi | | Kubler, Jason | | Kyrgios, Nick | | Millman, John | | Popyrin, Alexei | | Thompson, Jordan |
| | Austria (4) |
|---|
| Haider-Maurer, Andreas | | Melzer, Gerald | | Novak, Dennis | | Thiem, Dominic |
| | Belgium (2) |
|---|
| Bemelmans, Ruben | | Goffin, David |
|
| Bosnia and Herzegovina (1) |
|---|
| Dzumhur, Damir |
| | Brasil (1) |
|---|
| Dutra Silva, Rogerio |
| | Bulgaria (1) |
|---|
| Dimitrov, Grigor |
| | Canada (4) |
|---|
| Polansky, Peter | | Pospisil, Vasek | | Raonic, Milos | | Shapovalov, Denis |
|
| | Croatia (3) |
|---|
| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
| | Cyprus (1) |
|---|
| Baghdatis, Marcos |
| | Czech Republic (3) |
|---|
| Berdych, Tomas | | Safranek, Vaclav | | Vesely, Jiri |
|
| Dominican Republic (1) |
|---|
| Estrella Burgos, Victor |
| | France (12) |
|---|
| Benneteau, Julien | | Chardy, Jeremy | | Gasquet, Richard | | Halys, Quentin | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | Monfils, Gael | | Moutet, Corentin | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles | | Tsonga, Jo-Wilfried |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germany (10) |
|---|
| Bachinger, Matthias | | Brown, Dustin | | Gojowczyk, Peter | | Kohlschreiber, Philipp | | Marterer, Maximilian | | Mayer, Florian | | Stebe, Cedrik-Marcel | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
|
| Greece (1) |
|---|
| Tsitsipas, Stefano |
| | Hungary (1) |
|---|
| Fucsovics, Marton |
| | |
| Italy (7) |
|---|
| Berrettini, Matteo | | Caruso, Salvatore | | Fabbiano, Thomas | | Fognini, Fabio | | Lorenzi, Paolo | | Seppi, Andreas | | Sonego, Lorenzo |
| | Japan (3) |
|---|
| Daniel, Taro | | Nishioka, Yoshihito | | Sugita, Yuichi |
| | Kazakhstan (1) |
|---|
| Kukushkin, Mikhail |
| | Lithuania (1) |
|---|
| Berankis, Ricardas |
|
| Luxembourg (1) |
|---|
| Muller, Gilles |
| | | Netherlands (1) |
|---|
| Haase, Robin |
| |
| | | Russia (5) |
|---|
| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey | | Youzhny, Mikhail |
| | Serbia (4) |
|---|
| Djere, Laslo | | Djokovic, Novak | | Lajovic, Dusan | | Troicki, Viktor |
|
| | Slovenia (2) |
|---|
| Bedene, Aljaz | | Kavcic, Blaz |
| | South Africa (1) |
|---|
| Anderson, Kevin |
| | South Korea (2) |
|---|
| Chung, Hyeon | | Kwon, Soonwo |
|
| Spain (9) |
|---|
| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Ferrer, David | | Garcia-Lopez, Guillermo | | Lopez, Feliciano | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | | Swiss (2) |
|---|
| Federer, Roger | | Wawrinka, Stan |
| |
| Ukraine (1) |
|---|
| Dolgopolov, Alexandr |
| | United Kingdom (1) |
|---|
| Edmund, Kyle |
| | United States (13) |
|---|
| Donaldson, Jared | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | King, Kevin | | Kudla, Denis | | McDonald, Mackenzie | | Querrey, Sam | | Sandgren, Tennys | | Smyczek, Tim | | Sock, Jack | | Tiafoe, Frances | | Young, Donald |
| |
| Uzbekistan (1) |
|---|
| Istomin, Denis |
|