| Argentina (2) |
|---|
| Andreozzi, Guido | | Mayer, Leonardo |
| | Australia (4) |
|---|
| De Minaur, Alex | | Millman, John | | Popyrin, Alexei | | Tomic, Bernard |
| | |
| | France (2) |
|---|
| Chardy, Jeremy | | Monfils, Gael |
| | Greece (1) |
|---|
| Tsitsipas, Stefano |
| | Italy (3) |
|---|
| Baldi, Filippo | | Caruso, Salvatore | | Fognini, Fabio |
|
| Japan (1) |
|---|
| Nishioka, Yoshihito |
| | Kazakhstan (1) |
|---|
| Kukushkin, Mikhail |
| | Portugal (3) |
|---|
| Domingues, Joao | | Sousa, Joao | | Sousa, Pedro |
| |
| Spain (2) |
|---|
| Carreno Busta, Pablo | | Davidovich Fokina, Alejandro |
| | | United States (4) |
|---|
| Fritz, Taylor | | McDonald, Mackenzie | | Opelka, Reilly | | Tiafoe, Frances |
| |