| Argentinië (5) |
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| Cachin, Pedro | | Cerundolo, Francisco | | Etcheverry, Tomas Martin | | Schwartzman, Diego | | Trungelliti, Marco |
| | Australië (2) |
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| De Minaur, Alex | | Kubler, Jason |
| | Wit-Rusland (1) |
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| Ivashka, Ilya |
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| Bulgarije (1) |
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| Dimitrov, Grigor |
| | Canada (1) |
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| Shapovalov, Denis |
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| | Finland (1) |
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| Ruusuvuori, Emil |
| | Griekenland (1) |
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| Tsitsipas, Stefanos |
| | Hongarije (1) |
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| Balazs, Attila |
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| Italië (5) |
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| Arnaldi, Matteo | | Giustino, Lorenzo | | Musetti, Lorenzo | | Passaro, Francesco | | Sinner, Jannik |
| | Japan (1) |
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| Nishioka, Yoshihito |
| | Kazachstan (2) |
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| Bublik, Alexander | | Shevchenko, Alexander |
| | Nederland (1) |
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| Brouwer, Gijs |
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| Noorwegen (1) |
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| Ruud, Casper |
| | | Rusland (2) |
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| Khachanov, Karen | | Kotov, Pavel |
| | Slowakije (1) |
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| Kovalik, Jozef |
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| Spanje (11) |
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| Alcaraz, Carlos | | Andujar, Pablo | | Bautista Agut, Roberto | | Davidovich Fokina, Alejandro | | Lopez, Feliciano | | Martinez, Pedro | | Munar, Jaume | | Ramos-Vinolas, Albert | | Rincon, Daniel | | Verdasco, Fernando | | Zapata Miralles, Bernabe |
| | Oekraïne (1) |
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| Krutykh, Oleksii |
| | Verenigd Koninkrijk (2) |
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| Evans, Daniel | | Norrie, Cameron |
| | Verenigde Staten (3) |
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| McDonald, Mackenzie | | Shelton, Ben | | Tiafoe, Frances |
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