| Argentina (2) |
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| Del Potro, Juan Martin | | Schwartzman, Diego |
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| Thiem, Dominic |
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| Belgium (4) |
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| Flipkens, Kirsten | | Goffin, David | | Mertens, Elise | | Uytvanck, Alison Van |
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| Abanda, Francoise | | Auger-Aliassime, Felix | | Bouchard, Eugenie | | Polansky, Peter | | Pospisil, Vasek | | Raonic, Milos | | Shapovalov, Denis | | Zhao, Carol |
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| China (2) |
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| Cilic, Marin | | Coric, Borna |
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| Wozniacki, Caroline |
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| Chardy, Jeremy | | Cornet, Alizé | | Garcia, Caroline | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | Mladenovic, Kristina | | Paire, Benoit | | Pouille, Lucas |
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| Goerges, Julia | | Gojowczyk, Peter | | Kerber, Angelique | | Maria, Tatjana | | Zverev, Alexander |
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| Russia (9) |
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