| Argentina (2) |
|---|
| Londero, Juan Ignacio | | Mayer, Leonardo |
| | Croatia (2) |
|---|
| Martic, Petra | | Vekic, Donna |
| | Czech Republic (1) |
|---|
| Vondrousova, Marketa |
| |
| | Greece (1) |
|---|
| Tsitsipas, Stefano |
| | | Latvia (1) |
|---|
| Sevastova, Anastasija |
|
| Spain (2) |
|---|
| Muguruza, Garbiñe | | Nadal, Rafael |
| | Switzerland (2) |
|---|
| Federer, Roger | | Wawrinka, Stan |
| | United Kingdom (1) |
|---|
| Konta, Johanna |
| | United States (1) |
|---|
| Stephens, Sloane |
|