| Argentina (4) |
|---|
| Baez, Sebastian | | Cerundolo, Francisco | | Coria, Federico | | Schwartzman, Diego |
| | Colombia (1) |
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| Galan, Daniel Elahi |
| | | Danimarca (1) |
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| Rune, Holger |
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| Finlandia (1) |
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| Ruusuvuori, Emil |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germania (5) |
|---|
| Altmaier, Daniel | | Kuhn, Nicola | | Rehberg, Max Hans | | Struff, Jan-Lennard | | Topo, Marko |
| | Italia (3) |
|---|
| Fognini, Fabio | | Musetti, Lorenzo | | Nardi, Luca |
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| Kazakistan (1) |
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| Bublik, Alexander |
| | Lituania (1) |
|---|
| Berankis, Ricardas |
| | Olanda (2) |
|---|
| Griekspoor, Tallon | | Zandschulp, Botic van de |
| | Russia (3) |
|---|
| Karatsev, Aslan | | Khachanov, Karen | | Rublev, Andrey |
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| Serbia (3) |
|---|
| Djere, Laslo | | Krajinovic, Filip | | Lajovic, Dusan |
| | Slovacchia (2) |
|---|
| Kovalik, Jozef | | Molcan, Alex |
| | Slovenia (1) |
|---|
| Bedene, Aljaz |
| | Spagna (3) |
|---|
| Alcaraz, Carlos | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro |
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