| Argentina (3) |
|---|
| Del Potro, Juan Martin | | Pella, Guido | | Schwartzman, Diego |
| | Australia (3) |
|---|
| De Minaur, Alex | | Kyrgios, Nick | | Millman, John |
| | Austria (1) |
|---|
| Thiem, Dominic |
| |
| Bulgaria (1) |
|---|
| Dimitrov, Grigor |
| | Canada (2) |
|---|
| Auger-Aliassime, Felix | | Shapovalov, Denis |
| | Croatia (2) |
|---|
| Cilic, Marin | | Coric, Borna |
| | France (7) |
|---|
| Chardy, Jeremy | | Gasquet, Richard | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles | | Tsonga, Jo-Wilfried |
|
| Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germany (3) |
|---|
| Kohlschreiber, Philipp | | Struff, Jan-Lennard | | Zverev, Alexander |
| | Greece (1) |
|---|
| Tsitsipas, Stefano |
| | Hungary (1) |
|---|
| Fucsovics, Marton |
|
| Italy (7) |
|---|
| Basso, Andrea | | Berrettini, Matteo | | Cecchinato, Marco | | Fognini, Fabio | | Seppi, Andreas | | Sinner, Jannik | | Sonego, Lorenzo |
| | Japan (2) |
|---|
| Nishikori, Kei | | Nishioka, Yoshihito |
| | Kazakhstan (1) |
|---|
| Kukushkin, Mikhail |
| |
| | | Russia (2) |
|---|
| Khachanov, Karen | | Medvedev, Daniil |
| | Serbia (2) |
|---|
| Djere, Laslo | | Djokovic, Novak |
|
| Spain (5) |
|---|
| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Switzerland (2) |
|---|
| Federer, Roger | | Wawrinka, Stan |
| | United Kingdom (3) |
|---|
| Edmund, Kyle | | Evans, Daniel | | Norrie, Cameron |
| | United States (3) |
|---|
| Fritz, Taylor | | Johnson, Steve | | Tiafoe, Frances |
|