| Argentina (3) |
|---|
| Baez, Sebastian | | Bagnis, Facundo | | Delbonis, Federico |
| | Australia (4) |
|---|
| Kyrgios, Nick | | O'Connell, Christopher | | Popyrin, Alexei | | Thompson, Jordan |
| | | Repubblica Ceca (1) |
|---|
| Vesely, Jiri |
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| Finlandia (1) |
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| Heliovaara, Harri |
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| Gaston, Hugo | | Mannarino, Adrian |
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| Basilashvili, Nikoloz |
| | Germania (1) |
|---|
| Altmaier, Daniel |
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| Italia (3) |
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| Fognini, Fabio | | Sonego, Lorenzo | | Travaglia, Stefano |
| | Norvegia (1) |
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| Durasovic, Viktor |
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| Karatsev, Aslan |
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| Kecmanovic, Miomir | | Lajovic, Dusan |
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| Spagna (3) |
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| Davidovich Fokina, Alejandro | | Martinez, Pedro | | Ramos-Vinolas, Albert |
| | Regno Unito (2) |
|---|
| Evans, Daniel | | Murray, Andy |
| | Stati Uniti (5) |
|---|
| Cressy, Maxime | | Giron, Marcos | | Kudla, Denis | | Nakashima, Brandon | | Opelka, Reilly |
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