| Argentina (1) |
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| Del Potro, Juan Martin |
| | Australia (2) |
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| Millman, John | | Tomljanovic, Ajla |
| | Bielorussia (2) |
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| Azarenka, Victoria | | Sabalenka, Aryna |
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| Flipkens, Kirsten |
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| Monteiro, Thiago |
| | Canada (1) |
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| Bouchard, Eugenie |
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| Repubblica Ceca (1) |
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| Muchova, Karolina |
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| Kontaveit, Anett |
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| Pouille, Lucas |
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| Zverev, Alexander |
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| Bolelli, Simone |
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| Kukushkin, Mikhail |
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| Ostapenko, Jelena |
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| Puig, Monica |
| | | | Slovacchia (3) |
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| Cibulkova, Dominika | | Klizan, Martin | | Schmiedlova, Anna Karolina |
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| Spagna (3) |
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| Bautista Agut, Roberto | | Lopez, Feliciano | | Verdasco, Fernando |
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| Tsurenko, Lesia |
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| Evans, Daniel |
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| Johnson, Steve |
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