| Australia (1) |
|---|
| Ebden, Matthew |
| | Belarus (2) |
|---|
| Gerasimov, Egor | | Ivashka, Ilya |
| | Bosnia-Herzegovina (1) |
|---|
| Dzumhur, Damir |
| |
| Croatia (2) |
|---|
| Cilic, Marin | | Coric, Borna |
| | Cyprus (1) |
|---|
| Baghdatis, Marcos |
| | Czech Republic (2) |
|---|
| Berdych, Tomas | | Vesely, Jiri |
| |
| France (3) |
|---|
| Monfils, Gael | | Moutet, Corentin | | Paire, Benoit |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germany (2) |
|---|
| Kohlschreiber, Philipp | | Struff, Jan-Lennard |
| | Greece (1) |
|---|
| Tsitsipas, Stefano |
|
| Hungary (1) |
|---|
| Fucsovics, Marton |
| | India (1) |
|---|
| Ramanathan, Ramkumar |
| | Italy (2) |
|---|
| Berrettini, Matteo | | Fabbiano, Thomas |
| |
| Kazakhstan (1) |
|---|
| Kukushkin, Mikhail |
| | Lithuania (1) |
|---|
| Berankis, Ricardas |
| | Netherlands (1) |
|---|
| Haase, Robin |
| | Poland (1) |
|---|
| Hurkacz, Hubert |
|
| Russia (2) |
|---|
| Khachanov, Karen | | Medvedev, Daniil |
| | Slovenia (1) |
|---|
| Bedene, Aljaz |
| | Spain (2) |
|---|
| Bautista Agut, Roberto | | Verdasco, Fernando |
| | Switzerland (1) |
|---|
| Federer, Roger |
|
| United States (1) |
|---|
| Kudla, Denis |
|