| Argentina (3) |
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| Baez, Sebastian | | Cerundolo, Francisco | | Schwartzman, Diego |
| | Austrálie (3) |
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| De Minaur, Alex | | Kokkinakis, Thanasi | | Kyrgios, Nick |
| | | Bulharsko (1) |
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| Dimitrov, Grigor |
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| Kanada (2) |
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| Auger-Aliassime, Felix | | Shapovalov, Denis |
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| Ruusuvuori, Emil |
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| Bonzi, Benjamin |
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| Zandschulp, Botic van de |
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| Hurkacz, Hubert |
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| Molcan, Alex |
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| Alcaraz, Carlos | | Bautista Agut, Roberto | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert |
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| Laaksonen, Henri | | Wawrinka, Stan |
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| Velká Británie (3) |
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| Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
| | USA (12) |
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| Brooksby, Jenson | | Cressy, Maxime | | Fritz, Taylor | | Giron, Marcos | | Isner, John | | Korda, Sebastian | | McDonald, Mackenzie | | Nakashima, Brandon | | Paul, Tommy | | Shelton, Ben | | Tiafoe, Frances | | Wolf, J.J. |
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