| Аргентина (4) |
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| Baez, Sebastian | | Cerundolo, Francisco | | Coria, Federico | | Schwartzman, Diego |
| | Колумбия (1) |
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| Galan, Daniel Elahi |
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| Финляндия (1) |
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| Ruusuvuori, Emil |
| | Грузия (1) |
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| Basilashvili, Nikoloz |
| | Германия (5) |
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| Altmaier, Daniel | | Kuhn, Nicola | | Rehberg, Max Hans | | Struff, Jan-Lennard | | Topo, Marko |
| | Италия (3) |
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| Fognini, Fabio | | Musetti, Lorenzo | | Nardi, Luca |
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| Казахстан (1) |
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| Bublik, Alexander |
| | Литва (1) |
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| Berankis, Ricardas |
| | Нидерланды (2) |
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| Griekspoor, Tallon | | Zandschulp, Botic van de |
| | Россия (3) |
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| Karatsev, Aslan | | Khachanov, Karen | | Rublev, Andrey |
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| Сербия (3) |
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| Djere, Laslo | | Krajinovic, Filip | | Lajovic, Dusan |
| | Словакия (2) |
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| Kovalik, Jozef | | Molcan, Alex |
| | Словения (1) |
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| Bedene, Aljaz |
| | Испания (3) |
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| Alcaraz, Carlos | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro |
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