| Australia (2) |
|---|
| Kyrgios, Nick | | Popyrin, Alexei |
| | Austria (1) |
|---|
| Thiem, Dominic |
| | Belgium (2) |
|---|
| Goffin, David | | Mertens, Elise |
| |
| Czech Republic (1) |
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| Pliskova, Karolina |
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| Kontaveit, Anett |
| | | Germany (2) |
|---|
| Kerber, Angelique | | Zverev, Alexander |
|
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| Diyas, Zarina | | Putintseva, Yulia |
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| Gulbis, Ernests |
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| Bertens, Kiki |
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| | | Russia (4) |
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| Khachanov, Karen | | Medvedev, Daniil | | Pavlyuchenkova, Anastasia | | Rublev, Andrey |
| | Spain (4) |
|---|
| Carreno Busta, Pablo | | Muguruza, Garbiñe | | Nadal, Rafael | | Verdasco, Fernando |
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| Svitolina, Elina |
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|---|
| Bellis, CiCi | | Fritz, Taylor | | Isner, John |
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