| Argentina (2) |
|---|
| Andreozzi, Guido | | Mayer, Leonardo |
| | Australia (4) |
|---|
| De Minaur, Alex | | Millman, John | | Popyrin, Alexei | | Tomic, Bernard |
| | |
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| Chardy, Jeremy | | Monfils, Gael |
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| Tsitsipas, Stefano |
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| Baldi, Filippo | | Caruso, Salvatore | | Fognini, Fabio |
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| Giappone (1) |
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| Nishioka, Yoshihito |
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| Kukushkin, Mikhail |
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| Domingues, Joao | | Sousa, Joao | | Sousa, Pedro |
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| Carreno Busta, Pablo | | Davidovich Fokina, Alejandro |
| | | Stati Uniti (4) |
|---|
| Fritz, Taylor | | McDonald, Mackenzie | | Opelka, Reilly | | Tiafoe, Frances |
| |