| Argentina (6) |
|---|
| Del Potro, Juan Martin | | Kicker, Nicolas | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego | | Zeballos, Horacio |
| | Australia (5) |
|---|
| De Minaur, Alex | | Ebden, Matthew | | Kokkinakis, Thanasi | | Kyrgios, Nick | | Millman, John |
| | |
| Bosnia and Herzegovina (2) |
|---|
| Basic, Mirza | | Dzumhur, Damir |
| | Brasil (1) |
|---|
| Dutra Silva, Rogerio |
| | Bulgaria (1) |
|---|
| Dimitrov, Grigor |
| | Canada (3) |
|---|
| Pospisil, Vasek | | Raonic, Milos | | Shapovalov, Denis |
|
| | Croatia (3) |
|---|
| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
| | Cyprus (1) |
|---|
| Baghdatis, Marcos |
| | Czech Republic (2) |
|---|
| Berdych, Tomas | | Vesely, Jiri |
|
| Dominican Republic (1) |
|---|
| Estrella Burgos, Victor |
| | France (7) |
|---|
| Chardy, Jeremy | | Gasquet, Richard | | Hemery, Calvin | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | Paire, Benoit | | Simon, Gilles |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germany (6) |
|---|
| Gojowczyk, Peter | | Kuhn, Nicola | | Marterer, Maximilian | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
|
| Greece (1) |
|---|
| Tsitsipas, Stefano |
| | Hungary (1) |
|---|
| Fucsovics, Marton |
| | | Italy (2) |
|---|
| Fabbiano, Thomas | | Fognini, Fabio |
|
| Japan (3) |
|---|
| Nishikori, Kei | | 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 (5) |
|---|
| Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan | | Troicki, Viktor |
| | | Slovenia (1) |
|---|
| Bedene, Aljaz |
|
| South Africa (1) |
|---|
| Anderson, Kevin |
| | South Korea (1) |
|---|
| Chung, Hyeon |
| | Spain (6) |
|---|
| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Ferrer, David | | Garcia-Lopez, Guillermo | | Lopez, Feliciano | | Verdasco, Fernando |
| |
| | United Kingdom (3) |
|---|
| Broady, Liam | | Edmund, Kyle | | Norrie, Cameron |
| | United States (13) |
|---|
| Donaldson, Jared | | Eubanks, Christopher | | Fratangelo, Bjorn | | Fritz, Taylor | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Mmoh, Michael | | Querrey, Sam | | Sandgren, Tennys | | Sock, Jack | | Tiafoe, Frances | | Young, Donald |
| | Uzbekistan (1) |
|---|
| Istomin, Denis |
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