| Argentína (1) |
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| Tirante, Thiago Agustin |
| | Bulharsko (1) |
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| Dimitrov, Grigor |
| | | Francúzsko (3) |
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| Halys, Quentin | | Moutet, Corentin | | Muller, Alexandre |
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| | Taliansko (3) |
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| Berrettini, Matteo | | Darderi, Luciano | | Sonego, Lorenzo |
| | Holandsko (1) |
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| Griekspoor, Tallon |
| |
| Rusko (2) |
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| Kotov, Pavel | | Rublev, Andrey |
| | Srbsko (2) |
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| Djere, Laslo | | Kecmanovic, Miomir |
| | Španielsko (2) |
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| Davidovich Fokina, Alejandro | | Martinez, Pedro |
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| Borg, Leo | | Ymer, Elias |
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| Švajčiarsko (3) |
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| Huesler, Marc-Andrea | | Stricker, Dominic | | Wawrinka, Stan |
| | Veľká Británia (2) |
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| Fearnley, Jacob | | Norrie, Cameron |
| | USA (3) |
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| Kovacevic, Aleksandar | | Nakashima, Brandon | | Paul, Tommy |
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