| Argentina (5) |
|---|
| Andreozzi, Guido | | Delbonis, Federico | | Londero, Juan Ignacio | | Pella, Guido | | Schwartzman, Diego |
| | Australia (2) |
|---|
| Millman, John | | Popyrin, Alexei |
| | Austria (1) |
|---|
| Thiem, Dominic |
| |
| Bosnia-Herzegovina (1) |
|---|
| Dzumhur, Damir |
| | Bulgaria (1) |
|---|
| Dimitrov, Grigor |
| | Canada (2) |
|---|
| Auger-Aliassime, Felix | | Shapovalov, Denis |
| | Croatia (2) |
|---|
| Cilic, Marin | | Coric, Borna |
|
| France (6) |
|---|
| Chardy, Jeremy | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | 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 (5) |
|---|
| Berrettini, Matteo | | Cecchinato, Marco | | Fognini, Fabio | | Seppi, Andreas | | Sonego, Lorenzo |
| | Japan (2) |
|---|
| Daniel, Taro | | Nishikori, Kei |
| | Kazakhstan (1) |
|---|
| Kukushkin, Mikhail |
|
| | Monaco (1) |
|---|
| Catarina, Lucas |
| | Poland (1) |
|---|
| Hurkacz, Hubert |
| |
| Russia (3) |
|---|
| Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
| | Serbia (3) |
|---|
| Djere, Laslo | | Djokovic, Novak | | Lajovic, Dusan |
| | Slovakia (1) |
|---|
| Klizan, Martin |
| | Slovenia (1) |
|---|
| Bedene, Aljaz |
|
| Spain (4) |
|---|
| Bautista Agut, Roberto | | Munar, Jaume | | Nadal, Rafael | | Verdasco, Fernando |
| | Switzerland (1) |
|---|
| Wawrinka, Stan |
| | | United Kingdom (2) |
|---|
| Edmund, Kyle | | Norrie, Cameron |
|
| United States (1) |
|---|
| Fritz, Taylor |
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