| Argentina (1) |
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| Londero, Juan Ignacio |
| | Belgium (2) |
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| Goffin, David | | Mertens, Elise |
| | Bulgaria (1) |
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| Dimitrov, Grigor |
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| Czech Republic (2) |
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| Pliskova, Karolina | | Vondrousova, Marketa |
| | | France (2) |
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| Moutet, Corentin | | Paire, Benoit |
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| Tsitsipas, Stefano |
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| Sevastova, Anastasija |
| | | Russia (1) |
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| Kudermetova, Veronika |
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| Djere, Laslo | | Krajinovic, Filip |
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| Kuzmova, Viktoria |
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| Hercog, Polona |
| | Spain (4) |
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| Carreno Busta, Pablo | | Muguruza, Garbiñe | | Nadal, Rafael | | Suárez Navarro, Carla |
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| Switzerland (2) |
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| Federer, Roger | | Wawrinka, Stan |
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| Svitolina, Elina |
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| Konta, Johanna |
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| Stephens, Sloane |
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