| 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 | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | Monfils, Gael | | Pouille, Lucas | | Simon, Gilles |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germany (3) |
|---|
| Kohlschreiber, Philipp | | Struff, Jan-Lennard | | Zverev, Alexander |
| | Greece (1) |
|---|
| Tsitsipas, Stefano |
|
| Hungary (1) |
|---|
| Fucsovics, Marton |
| | Italy (3) |
|---|
| Cecchinato, Marco | | Fognini, Fabio | | Seppi, Andreas |
| | | Kazakhstan (1) |
|---|
| Kukushkin, Mikhail |
|
| | Poland (1) |
|---|
| Hurkacz, Hubert |
| | | Russia (2) |
|---|
| Khachanov, Karen | | Medvedev, Daniil |
|
| Serbia (3) |
|---|
| Djere, Laslo | | Djokovic, Novak | | Lajovic, Dusan |
| | Slovakia (1) |
|---|
| Klizan, Martin |
| | Spain (8) |
|---|
| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Ferrer, David | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Switzerland (2) |
|---|
| Federer, Roger | | Wawrinka, Stan |
|
| United Kingdom (1) |
|---|
| Edmund, Kyle |
| | United States (4) |
|---|
| Fritz, Taylor | | Johnson, Steve | | Opelka, Reilly | | Tiafoe, Frances |
|