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