| Argentina (2) |
|---|
| Del Potro, Juan Martin | | Delbonis, Federico |
| | Australia (2) |
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| Barty, Ashleigh | | Thompson, Jordan |
| | Belarus (2) |
|---|
| Azarenka, Victoria | | Sabalenka, Aryna |
| |
| | France (2) |
|---|
| Pouille, Lucas | | Simon, Gilles |
| | Italy (2) |
|---|
| Caruso, Salvatore | | Fognini, Fabio |
| | Japan (3) |
|---|
| Nara, Kurumi | | Nishioka, Yoshihito | | Osaka, Naomi |
|
| Morocco (1) |
|---|
| Benchetrit, Elliot |
| | | Puerto Rico (1) |
|---|
| Puig, Monica |
| | Russia (1) |
|---|
| Kasatkina, Daria |
|
| | Slovakia (1) |
|---|
| Klizan, Martin |
| | Spain (1) |
|---|
| Bautista Agut, Roberto |
| | United Kingdom (1) |
|---|
| Edmund, Kyle |
|
| United States (4) |
|---|
| Anisimova, Amanda | | Collins, Danielle | | Fritz, Taylor | | Williams, Serena |
| |