| Argentina (1) |
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| Pella, Guido |
| | Australia (1) |
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| O'Connell, Christopher |
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| Bulgaria (1) |
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| Dimitrov, Grigor |
| | | | Croatia (1) |
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| Serdarusic, Nino |
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| France (2) |
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| Mannarino, Adrian | | Paire, Benoit |
| | Germany (1) |
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| Zverev, Alexander |
| | Italy (2) |
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| Cecchinato, Marco | | Travaglia, Stefano |
| | Kazakhstan (1) |
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| Bublik, Alexander |
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| Netherlands (1) |
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| Griekspoor, Tallon |
| | | Serbia (2) |
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| Krajinovic, Filip | | Lajovic, Dusan |
| | Spain (3) |
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| Carballes Baena, Roberto | | Rincon, Daniel | | Zapata Miralles, Bernabe |
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| Swiss (1) |
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| Huesler, Marc-Andrea |
| | Ukraine (1) |
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| Sachko, Vitaliy |
| | United States (5) |
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| Eubanks, Christopher | | Fritz, Taylor | | Giron, Marcos | | Shelton, Ben | | Wolf, J.J. |
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