| Argentina (2) |
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| Delbonis, Federico | | Schwartzman, Diego |
| | | Bulgaria (1) |
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| Dimitrov, Grigor |
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| Auger-Aliassime, Felix | | Shapovalov, Denis |
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| Holmgren, August |
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| Italia (4) |
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| Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
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| Stati Uniti (6) |
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| Eubanks, Christopher | | Fritz, Taylor | | Korda, Sebastian | | Kudla, Denis | | Nakashima, Brandon | | Paul, Tommy |
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