| Argentina (2) |
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| Delbonis, Federico | | Schwartzman, Diego |
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| De Minaur, Alex | | Millman, John |
| | Austria (1) |
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| Thiem, Dominic |
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| Dimitrov, Grigor |
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| Garin, Christian |
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| Gasquet, Richard | | Humbert, Ugo | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit |
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| Basilashvili, Nikoloz |
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| Struff, Jan-Lennard | | Zverev, Alexander |
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| Fucsovics, Marton |
| | Italy (8) |
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| Berrettini, Matteo | | Caruso, Salvatore | | Fognini, Fabio | | Mager, Gianluca | | Musetti, Lorenzo | | Sinner, Jannik | | Sonego, Lorenzo | | Travaglia, Stefano |
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| Bublik, Alexander |
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| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
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| Bedene, Aljaz |
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| Harris, Lloyd |
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| Evans, Daniel | | Norrie, Cameron |
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| Fritz, Taylor | | Opelka, Reilly | | Paul, Tommy |
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