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