| Argentina (3) |
|---|
| Baez, Sebastian | | Cerundolo, Francisco | | Schwartzman, Diego |
| | Australia (2) |
|---|
| De Minaur, Alex | | Popyrin, Alexei |
| | Austria (1) |
|---|
| Thiem, Dominic |
| | Bielorussia (1) |
|---|
| Ivashka, Ilya |
|
| | Bulgaria (1) |
|---|
| Dimitrov, Grigor |
| | |
| Repubblica Ceca (1) |
|---|
| Lehecka, Jiri |
| | Danimarca (1) |
|---|
| Rune, Holger |
| | Finlandia (1) |
|---|
| Ruusuvuori, Emil |
| | Francia (3) |
|---|
| Bonzi, Benjamin | | Gasquet, Richard | | Humbert, Ugo |
|
| Germania (2) |
|---|
| Struff, Jan-Lennard | | Zverev, Alexander |
| | Grecia (1) |
|---|
| Tsitsipas, Stefanos |
| | Ungheria (1) |
|---|
| Fucsovics, Marton |
| | Italia (5) |
|---|
| Berrettini, Matteo | | Musetti, Lorenzo | | Nardi, Luca | | Sinner, Jannik | | Sonego, Lorenzo |
|
| Kazakistan (1) |
|---|
| Bublik, Alexander |
| | Monaco (1) |
|---|
| Vacherot, Valentin |
| | Olanda (2) |
|---|
| Griekspoor, Tallon | | Zandschulp, Botic van de |
| |
| Polonia (1) |
|---|
| Hurkacz, Hubert |
| | Russia (4) |
|---|
| Gakhov, Ivan | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
| | Serbia (5) |
|---|
| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
| | Spagna (5) |
|---|
| Bautista Agut, Roberto | | Davidovich Fokina, Alejandro | | Munar, Jaume | | Ramos-Vinolas, Albert | | Zapata Miralles, Bernabe |
|
| Svizzera (2) |
|---|
| Huesler, Marc-Andrea | | Wawrinka, Stan |
| | Regno Unito (4) |
|---|
| Draper, Jack | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
| | Stati Uniti (4) |
|---|
| Cressy, Maxime | | Fritz, Taylor | | McDonald, Mackenzie | | Shelton, Ben |
|